MBD Attorneys harrasment

I get harassed with telephone calls and SMS's every day for payment on an SBSA account ***. I do not know anything about this account. I have asked them to remove my telephone number from their database, but they still call me daily and SMS me daily. I received an sms to contact them on *** via WhatsApp today. I sent them a WhatsApp and they have not responded. Is this a ****?