Rude and ******** salesman

Hi. I have just received a call now 01/07/2020 at 09h57. With this number *** and its registered as Liquid Capital on my true caller. The sales guy which I didn't get the name wanted to explain the products they would want to offer me. I go on and say I don't want any other added products and can't talk on the phone as I am at work. He insist on explaining and I drop the call. He again calls and I repeat that I am at work I can't be on the phone as I will get dismissed. The guy got so angry that he go on raising his voice that I am old and stupid and rude. I am still surprised what kind of a salesperson talks to clients like that.