Faulty Transaction Uber sa

On 9 March while in Cape Town with friends I received a SMS indicating a Uber sa transaction that has been reserved on my credit account for an amount of R440.80. I immediately phoned the number at the back of my card, without any success, I then dialled the ***** department cancelled my card and was sent a dispute form to complete and send back to FNB and somebody will phone me. I completed the form, sent it back on the 9th, twice after that (11 March 2020) and again to Louise van der Merwe 13 March 2020). Needless to say, the transaction went through on my account. Up to today, I did not receive a phone call from FNB to inform me about the progress. With my last email, I attached the trips that I booked with Uber. This is unacceptable as customer service is the most important component of a business!