Migration nightmare

I was contacted by another service provider on Vodacom's behalf, prompting me to consider migration, after reassuring me I wont pay a cent more, I was invoiced more than R1000 more than I usually pay. After cancelling the migration within 30 days (which was the period given to me to cancel the mitigation) I am now liable for the additional R1000. So Vodacom responded to my previous Hello Peter post and credited the R1000, thank you. However I just received confirmation that my migration is completed and when looking at my bill it amounts to the migration fees. So come next month I will be paying the R1000 more again. Will I now have to place a hello peter each month and have the R1000 credited back each month. This is poor service.