Untrustable Billing

I signed a new contract with MTN on the 23rd March 2016.I struggled for 3 weeks to get my device after I spend hours on the phone.To my suprise got a billing for double the amount I signed for.I spend another huge amount of time on the phone see reference numbers ***, ***, ***, *** and 4 people who just put me on hold for over ten minutes without coming back to me or giving me a reference number.Upon asking to speak to the supervisor Mpho I was told she is on the phone and I must phone back later.Did phone later and still got the same anser.This is absolute poor service and I can not recommend anybody to take up a contract with MTN.According to me your billing is dishonest and breach of contract.Up until today I have had no feedback whatsover.POOR POOR service.