MBD Collections - ******* Collection Attempts

This company continues to harass me several times per day for a debt I do not owe for which I have written communication from Vodacom "their client" and despite me telling them to contact their client for the necessary details they continue to badger me. Shocking behavior, they contacted my husband to enquire about my whereabouts, which I am certain is ******* considering the so called debt does not involve him, I believe this is a breach of the use of FICA and the POPIA act, if it continues, I will take steps against this company