Future Shop and Christmas Temps

The other day, I tried to return my external hard drive to Future Shop. It is less than one year old, barely used, and beyond hope of functioning. Unfortunately, I lost my bill when I moved, in May, but I've definitely been able to return things before at Future shop without the bill.

Myself: Hi, I bought my hard drive here less than a year ago, and it is now not working. I would like an exchange or repair.
Temp: You have bill? (she clearly doesn't speak English or French)
Myself: No, unfortunatley, when I moved in May, I lost my purchase records. You must have it in your system, though?
Temp: How you pay?
Myself: How did I pay last year? Debit, I believe.
Temp: Debit ... no.
Myself: What do you mean debit no?
Temp: We ... 3 months ... credit card ...
Myself: No, I paid by debit.
Temp: No ... UNLESS credit card, we ... only 3 months.
Myself: So what you're saying to me is that you only keep records for 3 months, unless it's paid by credit card?
Temp: Yes. Statement?
Myself: I can get my statement, if that would help.
Temp: Exchange only.
Myself: So if I get my statement, you can only do an exchange? An exchange would be fine ...
Temp: Credit card only.
Myself: Oh. So I can only get an exchange if I have my credit card.
Temp: Yes.
Myself: And my statement? If I bring in my statement?
Temp: Missing details.
Myself: (grinding teeth) Okay, so I can't bring in my statement. So what you're telling me is that you only keep records for 3 months of ALL your transactions made by debit and cash, and now that my external hard drive is broken and I don't have my bill, I'm stuck with a broken piece of merchandise and you won't do anything about it, because I paid by debit?
Temp: ... yes. Credit Card
Myself: I've already established with you that I didn't pay by credit card. And you're telling me that I have no options here, correct?
Temp: After 3 months, all debit go to head office ... Vancouver.
Myself: All transaction records go to Vancouver? Is there any way you can get my transaction record from the head office?
Temp: ... no.
Myself: So, am I correct is saying that even though it's been less than a year, you will do nothing about my broken external hard drive?
Temp: you ... try ... manufacturer.
Myself: Clearly. (storming off)