HORRIBLE CUSTOMER SERVICE

WORST CUSTOMER SERVICE IN THE WORLD. I have been struggling for 3 months going on 4 to get a refund from Mr Price. I placed an order online via their app but the was something wrong with the order and it was not placed. Mr Price took my money for the order but when I called to query they say they couldn’t find my payment. I struggled for a month while they tried to trace my payment. Finally after many calls and emails they found my payment. Now they can’t refund me cause they say my bank is rejecting the refund. HOW POSSIBLE IS THAT??? I provided them with a proof of banking confirmation but now they want to blame my account number and bank. I don’t know how many times I’ve called and how many emails I’ve sent. NOBODY seems to be able to assist me and no senior person wants to speak to me no matter how many times I call. WHAT MUST I DO TO GET HELP???