Mtn

Hello peter please help me regarding mtn contract that i finished paying it with the company vvm long time an i request for paid up letter they give it to me so now mtn give another company nimble group bt i finished paid with vvm an get my paid up letter when i send it to them they said i must contact nimble group that is busy calling me at work an i told them i finished paid with with vvm an email them the paid up letter bt they still want me to pay