Service charge debited in error

A service charge was debited against my account in October and when I inquired I was informed that this was for a will kept in safe custody. My standard will with Standard Bank was cancelled years ago. Your agent calls me with feedback and shouts at me, telling me every negative way this query can go as I am not able to provide proof of cancellation done years ago. No charge for will was done last year, or years before that, why out of the blue is this being charged.