Cancellation of Credit card 😞

Worst experience ever. I requested for my Credit card to be cancelled on the 28th of March 2022. I received a settlement letter for the amount to be paid before the 31st of March 2022. I paid the money on the 30th of March 2022. The letter mentioned that once the amount is paid before the date the account is considered to be closed and will be blocked. Imagine the surprise when I received a statement with an outstanding balance on the 22nd of April 2022. I immediatetly contact the call centre and spoke to 2 *********** staff members. One told me that I had to close the account online. This was never told to me in writing or orally. Surely this must have been part of the settlement letter. The 2nd person told me that there was still a transaction pending from the 27th of Feberuary 2022. When I pointed out how wrong she is she dropped the call on me. I phoned back and spoke to a knowledgeable person and he assisted to eventually get it cancelled. In the time I had the card I never missed a payment and was never in arrears.