paying for non existent data

In February i received a call from a guy from supersonic that spoke to me about extending my current contract with mtn. i was offered 60gigs of data and i agreed. i have never received the agreed data since March 2021. i called MTN regarding the matter and they gave me a number to contact. i contacted them and they said they see the changes done on my mtn account however, they are not sure as to why i have not received my data. they then said they will escalate the matter with MTN and that was in May. Today being July, i have not received any communication whatsoever. i took up on the offer as i knew my contract was supposed to end this year. I am not receiving any extra data as agreed with the outsourced company and now my contract with MTN has now been extended to February 2022. if this matter cannot be resolved by August, i would like to cancel my contract and WILL NOT PAY ANY CANCELLATION FES