BAD Service

I called Discovery bank 27 December to follow up on my dispute query, was advised by the agent to replace my card and get a new card to avoid any future online transactions being debited form my account, the client walked me through the process on the banking app. To my surprise the same merchant that i am currently fighting with to get my money back tried to debit my account AGAIN using my bank card number which according to the agent should of been null & void. I called the ***** department & to my surprise my account is still active & available for online transactions..... IMAGINE the anger because now i have to go through the whole process again however the agent did it on the system to ensure it is cancelled i received a reference number & was assisted thoroughly. Its bad enough i got ****med with this merchant now the assisting im getting is incorrect, as im also in a sector which assists cleint i am not unreasonable but to wait 30 days for my money back, my money that i needed & for a dispute to be cleared even Capitec has faster service with accurate assistance. Im thinking of cancelling my services and going to another bank