MBD harassment

I've complained so many times about this company. They only stop harassing me for a couple of weeks and then they start again. Even phoning me looking for other people and asking for info on other people which is against the POPI act. Cant they see my number is for me only? How can they assume its for other people as well? And even if I tell them today its the wrong number, they'll just phone again tomorrow. I received another letter telling me I havent paid in Dev 2023. Which I obviously did. And when I asked them this morning why did I get a letter if I already paid, they reply they are confused as to how I pay. And so rude. And this is after so many arrangements. They are imcompetent for an attorney firm. Im lodging complaints now against them. Tired of being harassed for actually paying my debt. If they cant work with accounts and cant figure out how payments I've done in a year, it makes me wonder what kind of a company employs people like that?