Wrong package

Hi.my name is Dzunani.I had a contract with MTN which expired November 2021.Around October I used to receive calls left right and center to recruit to upgrade,which I rejected all their offers until on the 16th of November one Consultant managed to convince me to take the offer of R149 monthly.To my surprise 20 December 2021 I was billed R320 which I reversed.no one is calling me now.I just received an sms daily telling me to pay R320.I called the office and was told that my upgrade is pending and the package of R149 is 5gb anytime and 20gb night.so now I have to surf the net between 12am till 5am and this is not the offer I agreed on.Please let MTN sort this mess immediately.I don't want my name to be blacklisted because of people who are hungry of sales instead of providing good service.since 2005 I was a loyal customer to MTN but this I can't take.My cellphone no in question is ***