Horrible Service

Good day. Ive been phoning vodacom for months regarding my contract minutes that fall away on the 1st of every month. I know that the previous months minutes can carry over for 30 days and this is what happened in the past but since Ive moved over to a new contract in October 2018, my minutes have ceased to carry over. Every month I phone them and every month I just get an sms stating that my service ticket has been closed. 1 month they gave me R55 airtime for the lost minutes. This doesnt help me at all coz the R55 expired at the end of that same month and I could only use the airtime after my minutes were depleted, which didnt happen. Vodacom are now robbing me by taking away minutes that I pay for monthly.