FNB Bad Service

I took out two FNB connect sim card a year ago on inception I was told that this card I could give 24 hours notice and I was happy with this, also told I would receive 2 GB data and an extra 2 per month, firstly after a month they just cancelled the extra 2 GB and didn't even notify me, when I phoned I was told this was a special which I was not never notified about. I continued with my two sim cards on the 19th of Novemer 2018 I contacted FNB connect and cancelled the cards and was politely told now I must give a months notice I explained this is not was I was told when I took this card out. On the 1st of December they debited my account with R250.00 (R125 per card when I only ever paid R99), not only did they debit my account but the data I had received previously I never received. I then went to FNB as they advertise an unauthorized debit order can be reversed immediately but of course this could not be done, so I requested that a stop be put on FNB Connect just to be told this cant be done, so I asked so you are telling me FNB connect can debit my account any time they like and there is not a thing I can do. I have been been with FNB 15 years and have never been treated so badly. I want my money back today.