Who called from 9729855021

I keep getting phone calls from this number and there telling me uts all about my computer and I keep telling them to stop calling my phone asked them what company they work for they said for Dell technical support and I know for a fact that dell does not call people at all so how do I completely from them calling me cause of this situation?

supposedly microsoft support - bogus no doubt

Called my cell. I did not answer. No message. Blocked them.