Harassment for debt I don't owe.

MBD keeps harrassing me with calls accusing me of a standard bank account I do not have, what is worse on Tuesday 23 September 2025 they sent me a message thanking me for the payment I made on 17 June 2022, if I owed standard bank as u said and that was the date of my payment then the debt prescribed.stop calling me and harrassing me, it's *******