Stop sending phishing voice calls, emails & sms

I keep getting phishing calls, emails & SMS from *** and *** among others from "CSS" purporting to represent Cell C with a Standard Bank account number *** to make EFT payments. My Cell C account is always settled in full at the end of each month. These phishing emails & SMSs are a nuisance as the SMS sender numbers keep changing. If these phishing emails, calls and or SMSs are sent within your company, can you stop sending them.