Incorrect debit from TELKOM

I’ve been a customer for 3 years and my debit order is on the 5th, this month they debited three times (5th, 15th and 25th) and now I’m left with bank charges of more than R500 plus more than a R1000 that they wrongly debited and all they are saying is that they had a glitch in their system and they are sorry! TELKOM is the worst when it comes to customer service, the consultant just keeps on saying sorry for that as if it’s going to bring my money back