i yogi promise to repair computer, but made it worse. Internet

They accessedd by compuer, but did not fix the problem.  They demanded money which I felt was excessive (150.+) and said they'd keep my pc running great for 1 year, after that I'd owe again.  A few months later, they called and since I was still having problems, I told them I'd given the computer away.  I told them I can't afford their 'service' and they should stop calling me.  About every 2-3 months, they call again, and even though I've told them I nolonger have a computer of my own, they insist.  They ask when I will have one, and I've told them probably never, but they continue to call. 

I received several missed calls on my cell phone this week (about 2 or 3 per day) and yesterday I answered on from an 'unavailable' number.  It was i-yogi.  I demanded they stop calling me, and told them I'd be reporting the abuse.  The person spoke very softly, and very poor English, so I don't know if he understood or not.