Bad customer service by First National Bank.

On the 30th of November 2019 a customer used his first national bank card to pay for fuel, the speed point device froze during the transaction, the customer then paid the R250 in cash and left. The customer's account was debited for the amount on the 3rd of December 2019, but the moneis were not paid into my account. On the 11th of December 2019, the customer brought his bank statement, which showed the debit of R250 to me and I logged the first call to resolve the issue. It is now the 8th of January 2020 and the customer has still not been paid back by fnb.