Cell C charges Customers for their Mistakes

My cellphone contract was meant to expire on 30th July 2023. At the beginning of May they had no handets I was interested in and I agreed to just have a SIM only contract. Almost a week later I was called by the upgrades dept again and offered a decent handset for an upgrade. The Lady I spoke to (KIM - and I have her cell number), assured me that the SIM only deal would be cancelled and the upgrade with handset will take its place. Which would mean that the new upgrade will only come into effect when the current contract term had lapsed. This did not happen. They gave me a new line for the new contract and charged me for it as well as my current contract. After numerous irate calls, and 2 months of paying for 2 separate contracts - they advised that my current contract will expire and go to prepaid which they can allocate onto the new line which will allow me to keep my old number. Upon calling them today (31st July 2023) to have my now prepaid number transferred over to the new contract so that my number still exists and continues as a contract, they tell me that I HAVE TO PAY R 250.00 to have the prepaid number transferred onto a contract number. THIS will not be accepted and I WILL NOT BE PAYING ANYTHING ADDITIONAL DUE TO THE FACT THAT THIS WAS A MISTAKE ON THEIR PART FROM THE BEGINNING. THEY ALLOCATED A NEW LINE TO MY ACCOUNT AND DIDNT FOLLOW THEIR OWN UPGRADE TERMS. The consultant refused to despatch me through to a supervisor or manager and assured me that someone will call me back - this has not happened. I use my phone for work and I cannot have this line as a prepaid number as I have to make calls. Their mistakes will not be paid for by me and this is the last time I will ever do an upgrade or have any contracts with Cell C. As soon as my contract terms are over - I will cancel all contracts with them and advise my family members and friends to do the same.