Get you act together

I have been receiving sms's from MBD since July 2019 for someone else's debt. I have called on numerous occasions and established with them that my cellphone number does not belong to the person owing the money and I have engaged with them via whatsapp too. I am disgusted that they refuse to remove my cellphone number from their system and continuously send me sms's requesting payment for debt that belongs to some random gentleman. This is beyond a joke and harassment. I want my number removed from their system and I want an apology from them for unfairly harassing me.