poor customer service

I bought an inwear evening dress at Blueroute mall. Then a week later took it to canal walk as the size was not correct, brand new tags on and everything, My only purchase on the account. The manager and Cashier would not help me as they claimed the blue route is on a different system, terrible customer experience. I was there after 2 on Sunday 11/02/2024 They did the same thing to another client who bought from N1 city, why must the client drive to Blue route for credit when you have branches all over, this was terrible service. Got to blue route and the manager said that there was no excuse for Canal walk not to help me, they could have called and asked any information they needed, costing me petrol driving back all that way, WHO WILL PAY MY PETROL BILL