Debt collection messages for a cancelled account

I cancelled my Rain Internet subscription last year in August as I was relocating from South Africa. I have not received any communication from Rain until yesterday. I received an email that I have a bill of R250, with a threat of being handed over to debt collectors. I did not understand the origin of this bill, as its been over a year since I've cancelled. Despite that, I settled the bill immediately and then contacted Support about this issue. I have not received any feedback from Support. However, a relative of mine in South Africa received a notice of action message for me on her phone number, which I never provided to Rain. This is after I have settled the R250 bill and contacted Support to resolve the issue. What kind of service is this?