Telkom Mobile accounts

Have been trying to solve a debit order problem for 3 months now, from asking them to re submit a returned debit (which was processed early) to having same debited 5x then doubled which cost me extra bank fees. Several calls to call centre including seeing manager at Pavillion branch - no luck. Have now charged me over R200 extra charges for all their incorrect manual debits. What do I have to do to fix this?