Bad Attitude at PQ Heathway Centre

I bought shorts size 42 on 21 Oct. and back home, the zip didn't close. My daughter (size 32) tried them on. The zip didn't close. I brought the shorts back on 23 Oct. and was told that I had the wrong till slip. I spoke to Shoness and Kathleen, the manager. I told them, it was the only slip I was given and even searched in my bag for another slip. No other slip. They insisted, they couldn't do a refund with the slip I had. It was against the rules to do a refund without the right slip. I told them I didn't know I needed 2 slips and all the information was on the slip I had. They said, no, not 2 slips, just the right one etc. etc. So, I wanted to know if they can give me a voucher. Yes, but it was only valid today. I have to choose something else right now, this moment. I mean... They couldn't phone head office either, because they had no working cell phone and gave us the head office number. They also don't have a landline at the shop or I would have phoned them upfront. So as a customer, you have no chance of resolving issues like this. You have to know the rules and follow them. They don't have to do that. I'm fuming.