BAD SERVICE - CHEETING CLIENTS

When my cell phone contract expired I changed the contract to a data only deal and was advised that at any time I can give one month notice and that the services will be terminated. When I phoned on 30/12/18 to have the contract cancelled I was transferred to the retentions unit where I was advised that I am on a 24 month contract and that I must pay an early termination fee of R231.87. I paid in this amount on Friday morning just after 6 am via internet transfer. When I phoned on Saturday to have the number changed to pre paid I was advised that I should call back on Monday. After several calls where I was told that the money has not been received as banks do not work on weekends I finally got through after 2 and was advised by Thumelo that the money is now in the account and that the phone will be changed to pre paid in between 2 to 24 hours. He then also advised me that another debit order of R201.63 will be going through my bank account on the 20th as the lady that gave me the amount did not take that into account. What I do not understand is how you can give someone an amount to pay in and then 3 days comes back with a different story. I still do not see how they can expect me to pay an extra debit order if I paid the termination amount in full. I feel the I am being done in here as I never entered into a contract in the 1st place. If I wanted to enter into a 24 month contract I would have taken a phone.