Missing payment

I did a interbank payment into my fnb credit card on the 04 of May. The payment was missing has it was paid into a edcon account. The payment was found and a transfer was done into my card on the 23 July and then the 24th it was reversed. I've been running around and no one can assist. I need the matter to be sorted out as the legal department is calling me know . The only person that could assist me was Elizabeth Joseph that found the payment