C & S Jewerly and Watch Repair

I am new to the downtown area and found this C&S location convenient. However, I had an issue with the service I received and how their processes failed me as a customer.
I dropped off my Polar watch for a new battery August 14^th. Its a CS300 digital heart rate monitor with wireless cycle computer funtions. Within the day, they called me to pick it up by 4pm. All is well, right??? Wrong, but I am getting to that.
When I picked up my watch on the 14^th, they told me about the lifetime battery. It had been about 4 years since I replaced it so I asked how will they know. I was told they put a mark inside the watch.
Fast forward to, September 12^th, just a few weeks after having the battery replaced. I noticed a haze on the inside of the watch and the display was malfunctioning. I also noticed a smudge and some dust/​dirt upon close inspection. Not good. I recall having showered with the watch on the day before after my workout and it got moisture in it. Why would my waterproof watch have moisture in it unless the seal was not carefully installed?
Here is where it gets good.
I dropped it off again to see if they can help me out. After all they are my watch repair shop of choice at that moment. They told me it would be tuesday… no call. So on Wednesday I called them I asked if my watch was ready. They informed me that the watch is still malfunctioning but there was nothing else they can do to help it. I was told to come pick up the watch.
I expressed to C&S that I was upset that the watch has failed after they replaced a battery and I felt at least I was due a refund on the initial battery service, but more importantly I felt they should rectify the situation. I feel they are responsible for my watch since the seal failed. They could have offered to help me get it fixed at a certified shop, or replace it. They did nothing of the sort.
Upon pressing for a refund of this battery service, I was told they had no record of me bringing my watch there for a battery. I was told they didn’t see their mark inside my watch indicating the battery was service there. They don’t have any record of me? And sadly I didn’t keep my cash receipt. Fair warning — keep your paperwork (ticket stub, receipt, close up picture of watch/​jewelry and service request) if you deal with this shop.
So they refuse to acknowledge me as a customer. But I have call records that prove they called me on the 14^th of August. Least they could have done is look through their tickets for a watch replacement on that day. They fail to acknowledge any responsibility for the broken watch.
Whether or not you think they are right or wrong, take my advice and keep your paperwork for that lifetime battery. And if you think they might disavow you as a customer, keep records of who, what, when, where, why. And if you think all this a is a bit over the top, just choose a different repair facility. Or better yet, send it in to the manufactuer for certified sevice. You will be much happier in the long run.
Good thing I can’t see my heart rate right now anyway. I am sure its through the roof.
Regards,
Disatisfied but lesson learned.

This place always has nice, friendly, helpful staff. Since I work downtown, it is extremely convenient for me. Over the past 3 – 4 years, I have taken about 6 different watches in for «lifetime» batteries, my wife loves watches. I also took in one watch for repair and one herringbone necklace for repair/​solder, I always receive great service and love the workmanship. Excellent work!