AT&T Advertising Solutions

I own a small construction company and do not have a large budget for marketing. After meeting with a represenative of the company they gave me one great presentation on how I would get multiple new contacts a month from their pay per click campaign. I have been with them for 6 months and so far no leads. The only calls I seem to get from them are wrong numbers.
Since I am a small business I can not answer every call and I explained that most of my calls will go to voicemail. I was assured that there would not be any issues. They have a tracking number people call instead of direct calling my number. This tracking number has an announcement that plays when I answer that the call was from their service. It is only heard on my end of the call. The problem is this announcement cuts off my outgoing voicemail message so people do not hear it. I lose potential clients because they hang up when they do not think they got my company. They keep saying it is a problem on my side, but it is not, my messages work perfectly when I am directly dialed. It only happens when their tracking number is used.
In short do not believe anything they say. Their product does not work.