A user received abusive and religiously offensive language from a telecaller after repeatedly rejecting their sales pitch. While legal action is an option, including reporting to cybercrime or regular police and complaining to the company, it can be a lengthy process. The advice given is to immediately disconnect and block such numbers, and to register your number with the National Do Not Call (NDNC) Registry by texting 'START 0' to 1909 to prevent future unwanted marketing calls.