Vodacom cancellation of contract

Absolutely shockingly pathetic. Called several times to cancel contract. Everytime I stated I wanted to cancel my contract the consultant could all of a sudden not hear me and dropped the call. Another consultant just put the call on mute and whilst I could see the call was still connected, the consultant did not respond. I have update my personal details multiple times and yet I have never received a statement for 3 of the phones I have contracts with them for.