Shocking service from Takealot!

Absolutely shocking service from Takealot. I bought an item which is still under guarantee, at a discounted price. The item is not working properly so we exchanged it. We were told that it cannot be exchanged because the price is different. The full price is however the same as before, it is merely discounted by R400 less than when we bought it. Takealot credited the account with the price we originally paid. If I buy another one now, I will lose R400. I have followed up with various people and I am told repeatedly that the return is concluded because they credited the account. The product is under guarantee, you have a replacement item in stock, you have to exchange it, it’s not that difficult!