MTN wrongfully blacklisted my lawfully owned device.

I have had a huge problem with MTN blacklisting our device that was legally bought cash brand new back in 2021. Never have we had a MTN contract or number but yet we are struggling to get MTN to whiteflagg our device after sending in copy of id's and affidavits as requested. Till today we are still struggling to get MTN to fix what they did in error making it a really bad experience with a service provider. We have confirmed how many times that our ID's and numbers are not linked to MTN in any way. We have spent tremendous amounts on airtime and going back and forth to the store. Very very bad experience and have reffered the matter to the correct complaint channels.