Bad service

I have a contract with vodacom and still paying my contract however am not happy with their service, mainly because one of my phones doesn't register a network I took it in for at a local vodashop wonderpark mall and when it returned they said it is unrepairable and adviced that I should claim the insurance that I am still paying and even the insurance told me I made my claim late and they can't help me, while they are busy still deducting my hard earned money. This month they did not give me airtime for my second device. Vodacom service is poor and I think I am going to instruct my bank not to allow their debit this month end unless they sort out my issues