MTN still phones for settling of account, months after husbands passing

My husband passed away on the 08th of April this year 2022. After informing all of his accounts, MTN still phones me to this day for payment of his account. I have sent numerous E-mails with all relevant documents without avail. I have sent an E-mail to the following People on the following days:

26/04 11:34 28/04 12:55 19/05 11:34

To the following E-mails:

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