Bad service

im being overcharged for a contract I opened with them last October I logged incident numbers and still no response,however they are too quick to lock my line without hesitation even though I'm still confused as to what contract I'm under exactly ,it's the second time they get my requests wrong when I first opened the contract I was put on the wrong which was an open contract when I requested for the u choose smart s then had to wait 3 months to migrate and now they messed up the migration and I'm being charged for two contracts under one line and I'm the one who is suffering,I just had a new born I'm struggling to do anything with this phone as it's always giving me problems I contacted Vodacom the agent named sipho couldn't help me because I'm not sure of the contract I'm under,I'm really fed up with Vodacom I want them to take back their phones because I've been having nothing but problems since I got this contract.