Bad Irregular service

I had my contract upgrade at the Chatz Cellular at Randridge Mall and asked the consultant to cancel my 3G contract, she instead renewed my 3G contract which was on a month to month contract for many years. I asked the consultant for a copy of the contract, she told me the printer is busy and I can come back after going to PNP, when I went back she said she would Email it to me, which never happened. When I received my bill, I went back to them all this after having a hip replacement. I asked for the contract, they could not produce a full contract but produced part of the contract. My husband clearly remembered paying R150 for the one upgrade, but they insisted he payed for 2 upgrades, when asked for a receipts they produced copies of 2 cash receipts for R150 and not one, for R300 also taking into account that those receipts does prove that my husband payed for them. We asked the Manager for CCTV footage, which he told us he would check and provide, has not happened to date. They now expect me to pay for the 3G that I am not using and an alternate number that I also canceled via the customer care centre and at Chatz Cellular. I am seriously considering migrating to another network but giving Vodacom a chance to respond seeing that I have been with them for almost 20 years. Guys please be very careful at Chatz cellular when doing any contracts and make sure you get copies of your contracts before you leave.