Charged so much and wrongly

I have a Telkom mobile contract. the 15th, they debited, I didn't have enough money on that account, I received a notification from the bank, and then transferred the money to them. today, Everything was fine, no service cut. today I received an invoice, they are charging me R220,00 for the unsuccessful debit which I then transferred to them, and on the statement it is appearing that I transferred. someone, please, make this make sense