Complaints about Phone Numbers855-571-####

phishing text from this phone number. Identified itself as Costco

From this phone number they have been calling me for at least two years, telling me that I am Bridgette, they call me, they send me text messages, emails. I tell them in different ways that I do not call myself that. Let me be quiet. I told them in good manners and also very angry. to see if they understand that. but there's no way they leave me alone. I've even threatened to sue them. but nothing. They call different phone numbers. please, what can I do? I've been so angry that my blood pressure and stress went up. I do not know what else to do. PLEASE SOMEONE ADVISE ME AND HELP ME IN THIS CASE. I CAN NOT ANYMORE. THANKS IN ADVANCE