Bad service and *****ing my money.

On 1 March 2022 returned items at a supplier and was given a credit on my credit card. Credit was confirmed by discovery via sms and e-mail notification. Despite this the credit has to date not been reflected on my account. I have been in contact with Discovery for 2 months and they still have not resolved the issue even after they confirmed it wa a fault on their side. I have escalated this issue with the managers, but discovery have extremely poor service. to date they have never ever followed up the matter with me and I am left having to contact them to get any feedback. Disgusting service. maybe time to cancel all my products currently held with the discovery group.