Horrific Service MTN SA

Horrifying service from MTN South Africa. I called MTN on 10 June 2023 to advise that I will not be continuing with my contract anymore cause I was told to call 30 days before the end of the contract. I did that and now I’m being charged early termination I did not terminate the contract early as I was advised to Call 3 0 days before. I also took a data sim but never got data in the first morning and now I’m being charged a pro rata for data I never even received. Now my total bill is double my normal bill. I do not understand how. Please fix this cause I’m NOT paying double. I called to cancel another contract an 12/07 and the gentleman I spoke to advised that he cannot help me. I do not understand what kind of service you guys are offering cause wow it’s been a nightmare dealing with you guys! Please sort this out asap cause I’m definitely not paying R4000 there ain’t no way! Someone better call me!!!!