Discount Textbooks Store

I would NEVER want to deal with this bookstore ever again. The Discount bookstore.
I understand that it is hard to deal w/​returns/​exchanges or refunds as a functioning bookstore, however, as a store to provide educational supplies they are not very helpful, nice, considerate or anything remotely close to it. I’m talkin about the discount bookstore near ryerson and have 3 other location in the GTA.
So here it goes: I have bought 2 textbooks an amount of 330 $ and I later found out it was incorrect and i went to return… so. i go and return and looked hard for an exchange since they dont issue refunds and only issue a credit and they basically do not care since they already have my money. so out of luck, they dont have any of my other course texts and they ONLY sell course textbooks, no supplies, no papers, no anything other than course textbooks and mostly for first year students. So i begged for a refund b. c i basically cannot find anything textbook to use for 300 $ and theres nothing else available to buy even if i want to use it! So he goes ok just take the credit and maybe u’ll change courses and u can come back. so fine. so bummed i left. I got home, to find out that the credit amount is lesser than my original amount that i paid. which i worked it out to be the amount less 5% text tax, with no explanation to why i would have a lesser amount as my credit note (handwritten, most unprofessional note) and obviously does not include any of my returns that i made. So i send them a quick email asking if they made a mistake on the amount and they had told me to come visit and speak to their manager.
So today, I went, asked for the manager which was super rude and unfriendly. I explained to him my situation as I am graduating and blah blah blah. and i asked about the amount of my «credit note.» He advise me to go sell my note to some other students and they will understand the amount and that they’lll know it’s worth more, and that i’m shit out of luck and goodbye. I said, i have no use for this credit and he goes. whats your point?! well clearly he hasnt been listening to me this entire time if he even asked this question! and again. i repeated myself. and he goes. yes u’ve said that and said i was very silly and that its always done this way to a credit note to NOT include tax in my note b/​c people will understand. i said NO. no one will understand, i certainly did not, and if i did i wouldnt be here! and i demanded him to correct the note to the full amount or issue me a refund. And he turned around and said «i dunno why you are making such a big deal out of this and said declined my offer.
So please, dont visit this bookstore, they scam tax and have limit availability of supplies no other products so they’ll just take your money once you paid.