Infected With 1-800-720-099? Guide to Remove 1-800-720-099 Scam

We received a blue screen last night indicating we had been havked and instructed to call 1-800-720-099.  After some time we called and they accessed our computer after being instructed to buy viras software we declined and told them we would call back
today.  After some research today I have sinse realized it may have been a scam.  We called the number, what will happen now.  Is this serious?

Take A Closer Look At 1-800-720-099 Pop-up

It might be quite difficult to hold back your worry and dismay as you see alerts on 1-800-720-099 pop-up. On this warning page, you will see sentences that highly resemble diagnosis from system firewall and predict serious computer errors ready to occur. Think about following its suggestions? Better to take a closer look at it before you call suspected hotline.