I had the same issue. Me and my wife opened a auto repair shop beginning of last year and immediately got alot of 5 star reviews on google because were honest with people and not out to get rich (which apparently hardly keeps the lights on but I'd still rather just be honest with people). Anyways we were solicited by yelp to try their service out with a free $350 worth of advertising. I figured that should last a month and what do I have to lose! The salesman also told me that yelp is to iphone what google is to android so I thought I'd be reaching a whole new group of potential customers. Well within 15 days that $350 was used up by all these clicks and not 1 phone call. Not only that, but after I cancelled, 3 reviews that were left by customers before I even had a yelp account were deleted or hidden from public so now I have no reviews at all. Glad google still displays our reviews!

Sorry to hear they got you too OP.