They couldn't not assist

I visited Edgar's mapoya mall, to return damaged goods that I bought through my account of which the goods were damaged. The cashier Brenda said she needed clarity from the manager of which she went and came back to tell me that they could not assist me because they have a stock taking next week on the 06 October 2015. Unfortunately they have counted their damaged goods and they have sealed the box, I must go back to Trade Route Mall and return it there how convenient is that, I then asked for a managed of which he came and told that I would not have bought it if it damaged, so he further said I might have damaged it myself, this is an accusation. Further more he could not refund me on my account but must give me a voucher, but I bought on my Edgar's account. Why is that he could not credit my account, he said I must read the t&c on their desk. This guy is very rude.