No communication regarding anything!!!

I am sick and tired of the service levels in this country. Altech autopage, i had a two year contact which expired end July 2015, i didnt cancel it so the normal process was that it would continue on a month by month basis until i renew or cancel. I get an sms in August stating that my contract has been cancelled and i have been migrated to prepaid. I didnt authorize anything??. .i call the call centre a couple of times then someone tries to help saying that someone cancelled my contract and that person will get back to me. I waited for a call but no answer. A couple of days later i get an sms saying that i am now on a new contract - straight up 100. This again was not authorized my myself???? I am now getting charged for data because ALTECH is making decisions on my BEHALF!!. My data bill is now racking up. Not impressed at ALL!!!