Harassment by SABC collections agent

I have been receiving threatening sms’and phone calls regarding a SABC account # ********** 96. I have advised this collection company now since last year that I AM NOT THE PERSON they are looking for. This year I have contacted them through WhatsApp, asking them to remove my contact details from this account. Everyrime they assure me that I am removed and then a few days later I am getting more sms’s. This is harassment!!