MTN mobile number of mine blocked after 24 months top-up contract had ended

My initial MTN mobile since 2015, I had it converted to a 24- months contract since 2019 July when I took a deal of R369 monthly debit contract for 2 MTN numbers : one with data, minutes and SMSs; and the other with only airtime of R55. July 2021 marked the end of contract, R254 monthly debit continued to be deducted for the period until April 2022 when I contacted MTN to terminate the contract. The debit for the R55 other mobile continued to October 2022 which I stated when I called in to terminate again that the mobile phone was lost so I couldn't continue with the other number. I have since reported to MTN that my initial number was blocked without reason for contract which ended some years back, I'm still not able to access the number because it has been blocked by MTN. I cannot use this mobile number and no help to resolve the same from MTN.