Previous months remaining minutes forfaited

When starting the new month my minutes,sms's and data from the previous month did not carry over. After phoning the call centre i was referred to the vodashop. I went there and logged a complaint after 48h I received a sms stating that my minutes,sms's and data remaining from the previous months were forfeited. In all the previous months it always carried over for indeed one month as was explained to me... did I miss a policy change on this? I have been a vodcom customer since I moved to SA 15 years ago and have multiple contracts I am however seriously considering cancelling everything and joining another network on prepaid, Clearly there is no sense on how you treat you guaranteed income base ie. contract customers.