Time to move accounts from Discovery Bank...

I sent through a request to Discovery Bank on the 14th of February 2022, asking for the address on my credit card statement to be changed. I supp**** the required proof of address documents etc. The address was incorrectly changed, the old merged with the new address. Now, it's one month later, several phone calls to the call centre all with empty promises of getting the address changed, "oh yes, i've sent through your request, it has been escalated", along with several emails and the address is still incorrect on the system. No-one can fix this?!