Stop spam calls

My laptop said there is a virus in its. And said to ring this number. She said is windows, that it was. She what number is coming up in I told her. She said there are 700 people on my laptop, then she said it’s will cost £299 to get it clear. She’s said do I use it for bank and shopping. Then the penny drop. It’s a scam. Lucky I don’t use it it on my phone. But she put a Virus on my Laptop. I will need to get it cleaned.