Billing disputes not investigated

I raised several queries with Telkom regarding their failure to properly investigate my billing dispute. I have queried this matter since November last year with operatives essentially telling me that I must just pay without addressing my problems. These were: 1. My bill was not pro-rated against the service cancellation date 2. I was billed for account cancellation when I was advised I would not be liable for a cancellation as I migrated services based on an offer they made to me. I have now been advised that the bill amount has been handed over to debt collectors.