My account has been debited 5 times in a space of 10days to the amount of R4607 instead of once to the amount of roughly R2400

My account has been debited 5 times in a space of 10days to the amount of R4607 instead of once to the amount of roughly R2400. Sent an email to customer service but no response came forth. Phoned and spoke to the lady by the name of Gabisile and had long conversation and eventually told me she will phone back in 5 minutes time but up to now she hasn’t phoned back 6 hours later and this leaves a very sour taste in my mouth. Can reverse those debit orders but I want them to explain how did this happen and why?