Account Blocked but paid

Vodacom has very poor service, its been two months already and my query is still not solved but rather its just got worse. My phone is blocked because according to their system I owe Vodacom. November the same thing happened and they called me after some time to apologise because they couldn't locate payment... Now again the same thing happened they asked for my bank statement I had sent them its been two weeks but still havent gotten feedback from them ...my phone is blocked and im told to call collection....Their social media team promised to call me up to this date nothing no feedback whatsoever from Vodacom.