collecting on account already paid

Good Day. I request you to remove my husbands account from your database and never to call him again for a Nashua Mobile account that was paid in full to the new service Provider (i have the proof). If this amount of R361.00 was not paid how is it possible to receive airtime and an active cellphone contract currently in use. The gentleman i spoke to last week, keeps telling me i was not suppose to pay Autopoage. How was ia suppose to know that Nashua Mobile handed this amount over to Creditworx and sold the contract to Autopage (which i am currently paying and receiving airtime) I was not aware of the handover over to creditworx and not even about the change in company. Pleas sort this out immediatly or i will report this to the Ombudsman, Hoping to hear from you soon and we want a letter to say this matter is now closed.