Telkom is a *******

I took out a cellphone contract from Telkom in October 2014,it was a top up as I clearly stated I want what I can use and when it's finished I will load myself, coming from a telecom industry ,having worked in pre paid contract and data,I knew what I was talking about.for the first year it was exactly that, Top up. I lost my sim and stayed for over 6 months without doing a sim swap and forfeited data and minutes. Last month I ran out of data and loaded megs 3 times using the Internet, the 4th time I bought a voucher which did not go through. I called the call centre wanting to know why, I was advised I can't load a voucher on the type of contract I have,I then asked how is it I loaded via Internet banking and not with a voucher. The conversation was escalated to a team leader and we went on for over an hour,long story short ,he confirmed I'm oh hybrid which to my understanding, is a topup. I got additional data and instead of paying my subscription of 259 month end,I paid 340 which puzzled me but I did not question.today I got my invoice and I must pay 589, I spoke to Perry who contradicted himself and what he said did not make sense.all in all telkom agents don't know their products well.i took out a topup contract where I paid the same amount every month, all of a sudden it changes,this after the sim swap.each time I tried connecting last month after I got a message that my data finished I could not log on but now I must pay.if I'm on a unlimited contract it was suppose to carry on and not cut me off.i have been advised to go back at the store and I will do that but I will not pay anything extra or more than 259 that I signed up for.when my contract ends,I'm definitely not upgrading, telkom is *********** people who know nothing about contracts well not me.florence Thring ***