Not cancelling debit order for 5 months now

Cancelled LTE (due to pathetic service) in November (with no device so only a 30 day cancellation period) so expected bill for December which was received. Debit order went off in January, waited for an hour in phone queue to be told it's cancelled, after February's debit order went off both phone (2 hour wait this time) and online account confirmed "cancelled" after March's debit order went into the store (hour long wait at menlyn branch) and was told it's cancelled. Debit order for May went off yesterday.

Telkom is *****ing my money for a service not rendered. Is there anyone at that pathetic "company" that can help???