MBD harassment

This company is now harassing me every day. Every day I have told them I am my 90 year old Aunt power of attorney over her accounts as she cannot remember anything. Her Vodacom account was cancelled last year and now this company won't stop calling me Apparently looking for money owing to Vodacom . We closed the account there is money owing! The more I try and explain they either put the phone down on me or argue that I cannot help them with her matter.

I am her POWER OF ATTORNEY... Legally done by an attorney and by Absa bank. I am the only one authorised to pay her accounts. She doesn't have a Vodacom account. Stop phoning stop harassing me and my 90 year old Aunt !