Well, Avast not the only one to go to bed with scamers.
Symantec has same pay tech support option with the "Boys From Bombay." Their rates start at $90/hour with no guaranty.
OP should read the EULA he agreed to w/iYogi. I am sure somewhere imbedded in the double talk is a statement that their is no guaranty. Good luck with credir card charge-back.
Wise up people! For these costs, you can get your malware removed locally and get a guaranty to boot!!