Resetting timing after it was taken a part in correctly on 99 2.0 liter AEG.

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after changing o ring,oil pressure light kept coming on. After some investigation I found that the oil pump chain tensioner broke. Well,to change that the crank pulley and crank timing gear had to be removed. I paid a backyard mechanic to pull the pulley off to get to plate to remove so tensioner could be replaced. Unfortunately, he didn't line up timing marks to TDC.he just pulled crank pulley off of timing belt. How can I get timing reset. I've pulled motor mount,put new water pump on but I cant get timing marks to line up on crank and cam. How can I do this without destroying valves. After putting new timing belt on and turning crank 20 times marks still won't line up. Any suggestions on how I can get this timing corrected and on time. This is a 2.0 liter AEG motor in a 99 jetta. Don't want to damage valves or pistons.