MTN cellphone contract

Good day, I have cellphone contract with MTN and my account was handed over to lawyer and my phone is locked along with airtime and data that comes with the contract, since then I have been paying and I'm committed to pay, but my problem is that my phone is still locked along with the airtime and data even though I am still charged for full service, I find to be unfair that MTN still full price of the agreed contract and I'm not getting airtime and data, i find it pointless for me to continue paying if mtn is ripping me off. I just want them to unlock and load the airtime and data.

I am committed continue paying my contract until the end of it. Regard, Ntsako ***