MTN Customer nightmare

It so sad being a proactive client. I took out a contract with MTN and i have been depositing the installment on the day i get paid before the debit order date which is the first i went to the branch to request for banking details so that i ensured i had paid all my obligations in time and the details were provided to me. From January i have been paying on my banking app and using my cell number as directed and right now my device was soft locked as MTN say i i am in arrears how so as i have provide my proof of payment and escalated this matter for close to 2 weeks but i have been sent from pillar to post with no resolve as currently my phone is still soft locked even after i have provided the proof of payment more than 5 times. Its frustrating during this lock down as i can not even go to the branch where i obtained the phone as its closed. I am supposed to be calling our employees using my phone as the company bought me airtime but now i have to go the office and use the landline. Countless emails have been sent and all i got is an acknowledgement. So disappointing on a large cooperation like MTN to fail me like this. The number of reference number i have received with regards to this is a bucketful meaning there is no followup.