Not giving services and debit orders are deducted three times without seeking permission

I am a customer of Cell C having contract with them for the past 2 years.I was entitled to receive the benefits for airtime, data and sms and was paying 249 per month and I was not getting service since July 31st.I contacted them at least 30 times within these days and didn't get any resolution for the past 14 days. Also I got debited 3 times in between for the days which I was not getting services. They want to drop off the call by saying excuses like you need to restart your phone or by saying you need to go to nearest outlet or your case is urged and will take 48 hours to resolve. I contacted supervisor Thapelo several times and also other supervisors and they said the back office is doing these kind of things. Finally I contacted Cell C Kolonnade and they asked to come with proof of payment and I came back to log a complaint on 11th and I didn't get any feedback. So I called them today and they told me to contact Customer service again and they tried to get rid of me. So finally I got really upset and I tried to convince them that none of them are giving me my benefits. So finally they called someone named Niel and he said that if I come over to the Cell C Kolonnade office, they will add my benefits back. So when I reached there they were busy talking to the customer service guy or someone and was telling them that I came to the office because of being instructed by Niel and I could overhear that the office lady was asking for Niel and he wasn't there. So finally they insisted me to take the Pinnacle 3GB plan which gives 2GB day data+1GB night data and also 90 minutes other-net calls+210 on-net calls which was much lower than what I used to get for the previous plan. And they gave a paper quickly for me to sign and to get rid of the issue. I asked them if its month to month contract and they agreed it I can even discontinue by the end of the month without any penalty. When we came back home and checked it was a 24 months contract. Its really terrible experience which I have with you guys. It was worst than looting.I am a pensioner and in this old age I had to run around to get it sorted out.It is a very unfair and unreasonable treatment to a customer like me.