Mtn poor service

I renewed my contract with mtn in January 2024 for 150gb anytime datea and 150gb night data. The data was loaded on 12th of month. On 12 February they loaded my data. On Saturday 24th February I was informed by wifi that I had to buy more data. I was shocked and confused as we don't use much data. On Monday 26 February I got through to many different departments who could not assist me and eventually spoke to a person in their data coverage department who told me not all the data was loaded. I was eventually informed that they loaded 150gb night data but only 50gb anytime data on 12 February which was 100gb less than we agreed upon. I contacted the ***** dept and was given a package dispute number *** and told they would contact me within 24 to 48 hours which didn't happen. I contacted them and once again was given a runaround. Eventually on 28 February 2024 I spoke to a gentleman who informed me the same thing and told me about the additional charges for billing which I did not ask for nor informed thereof. I got an REQ no *** and was told to phone customer care within 48 hours which I did. Once again I got a runaround where others told me it's not finalized even till today 4 March 2024. I was informed by Sesega in customer care on Friday 1 March that the 100gb they will only give us when they load the new data on 12 March. I told her we don't have data now and my husband needs the data as his studying. I informed their billing department that we cannot pay a bill that we have not received the service for and they argued with me I then asked to speak to cancelations and they referred me to retention dept who advised me that I have to pay a cancelation fee. I tried to explain to the consultant that they have reneged on their contract which actually makes our contract null and void and I will not pay the fee but it fell on deaf ears. Wehave paid R 500 for additional data in the meanwhile which is totally unfair. This is also not the first time I have had such poor service from mtn. Previously I took out 2 contracts and was billed for 4 contracts which after 6 months of being given the runaround they eventually refunded me. Please assist as we need our data urgently and would like to cancel this contract and look for a new service provider.