I filed for social security benefits in May, 2016 (I am still working and will continue to work). I will turn 66 (FRA) in august, 2016. I was told by the Social Security rep that the withheld benefits for May, Jun and July (suspended because my earnings exceeded the limit) would be paid in a lump sum in January of 2017. Can you tell me if that is the case? I am expecting my first social security check in September 2016.

Michael,
No, that is not correct. You will not receive a lump sum payment in Jan 2017.
The benefits that are lost due to the Earnings Test are not repaid. Rather, the early retirement reduction factor is adjusted at your full retirement age (FRA) to account for early benefits that you didn't actually receive. In your case, since you took your benefit three months early, they were reduced by 1.67%. But, if you never actually receive any early benefits, then the early retirement reduction factor will be eliminated at your FRA and your future benefits will not be reduced. It would be just as if you didn't take your benefit early.
Best,
Mike