Mtn deducted 3 time from my account

I would like to complain about Mtn they deducted R4500 from my account in total. My account was debited 3 times.. My debits bounced this is ***** I was not notified that my account will be debited when I called to enquire I was told it would take y days then it was 3 days now 21 days I must wait for Mtn incorrect faults thus is not on. I will in furture cancel all contracts with this company and I will seek legal action.