Unsavoury business practice!

I sent several email correspondence to Vodacom in regard with their allocated third party Elite Mobile non delivery of service! Spoke to Mina (Vodacom) whom connected me to Mandla (Elite Mobile) both promised me they’ll listen to recording between myself and Elite Mobile agent and get back to me in 3-4 days! That’s 3-4 weeks ago! Email correspondence to Vodacom in this regard go unanswered! I have reference number which Mina, listening in on conversation l had with Mandla! My contract was changed and now l must top up and costing me more!