Vodacom unwilling to resolve faulty billing but very willing to cut services

I have been struggling with Vodacom Accounts for months - my bill varies by R1k every month - even though it has a block on. I have spoken to customer service, social media, credit control - and the tactic is to play dumb as they then don't need to resolve issue - now they manage to phone back as account is in arrear and want to cut my connection but no one is still able to phone back about my query ...poor show Vodacom. Ive been a client for 10 years but keep treating loyal customers like we are disposable - you are not the only provider