poor service,bad attitude,no response no help

Good day to you, I have a querry with Altech netstar,I received a call from their call centere between june/august2013 saying to me that my contract will end in september 2013 and I will be on a reduced billing of R60 a month than the normal R111.00.I was billed R111.00 after september up until now, I called numerous times to resolve/rectify but I seem to fall on deaf ears.I don't get any calls from altech until call ,I get smses saying I'm in arreas and will be handed over to legal services,when spoken to alvina she says I have to make payment and was rude and don't seem to assist me in locating who contacted me about price reduction.how is it my fualt when their staff member contacted me with this price reduction?I was in a 3years contract with them and did not miss any payment.is this the way to treat your customer of 3years to you? I feel no joy out frm the people I spoke to.its gone 2weeks now that I am awaiting a call from a supervisor but no1 contacted me until I did and I get smsed saying I will be handed to legal services.I feel I'm unfairly treated and need something to be done.how can I be in arrears when my contract expired.I'd appreciate your assistance .