Credit Solution Services STOP harassing me.

Credit Solution Services have been harassing for more that 6 months now. For some reason my mother gave their client my email address for correspondance. My mother is late as of December 2020 and can no longer may payment to CSS client. As per norm they have been emailing to try and get payment arrangements. I have rep**** to their emails in more than one occasion explaining the situation and giving them information as to who they can contact to confirm everything. No one has responded to my emails and i still get these annoying emails from CSS.