Vodacom *****s your money and lies about it

Vodacom called me to upgrade my 2 contracts. They promised nothing would change. I would just have to pay more for the 2 new mobile phones. I had 1180.12 airtime on my one contract and 748.68 on the other. Two months after the upgrade R740.12 airtime was removed from the one contract and around R292.00 from the other. Called on 2 Jan 19 to report it. They said it was due to upgrade. I asked them to go listen to the transcripts and they said they would and come back to me with 7 to 14 working days. I called them again on 21 Jan 19 and was told the same story ie they will come back to me after investigation. Today I called again 1.5 months later. Senitemba tell me I need to speak to upgrades. milli in upgrade tell me I need to speak to rewards. I asked to be put through to cancellations. The manager there Imanual Ramavale tells me if I cancel it will cost me in excess of R3000.00 cancellation fee. My monthly fee for this contract is R235.00. Are these people serious?