Account closure

My husband had a personal loan with FNB. On the 17th of August he suffered a triple heart attack. He was thankfully treated and then transferred to ICU after which he was brought home to continue his recovery. During that time I completed the necessary documentation to claim under the Dread Disease section of his loan insurance. I was treated with the utmost care and consideration in all my dealing with the claims department , it was a frightening for us as a family and I greatly appreciate how the entire claim process was handled. The claim was approved and pay out was done on the outstanding balance of the loan. I have however not experienced the same level of service from the accounts department. I have requested a paid up letter/confirmation that the account is closed on numerous occasions and have been literally sent from pillar to post and promised(3 times) that I would receive confirmation that the account is closed..... but still no letter/document has been received. We have also been harassed by sms's from Ida Attorneys demanding payment on the loan. I have done my utmost to sort this situation out in the midst of caring for my husband who is not well but I now am resorting to this platform in desperation. Please assist.