no proper notification on price increase

good day<br> <br> i have been with vodacom for a few years now, and never have i had this before. since last year i have not been receiving my invoices from vadacom but i always pay before so they just deduct the money from the money that is already in their bank. now a few weeks back i went on my profile on vadacoms website and saw that my monthly payment was increased with no notification at all so i phoned and phoned spoke to about 20 people and then they phoned me today stating that they did notify me via tv and radio, so i explained to the guy that i dont have dstv or normal tv and i have cds in my car. then he said but everyone got the sms from them so i said ok please check on my number if this was sent to me and he said no it was not sent to me but unfortuanatly they cant help me they did the media thing so thats that if i have a problem i can phone some other department from vodacom and i said well i think they can phone me as i have wasted much time effort and money already trying to get invoices from them and help in regards with this matter, he rep**** that in that department they can only receive calls and not make them so i have to phone them?? isnt this breach of contract?