Increase number of free trial service users

I am looking for someone to build referrals to a free trial service. The selected provider needs to have a proven track record and use only ethical marketing methods (absolutely no SPAM, etc). The requirement is to drive traffic to a specified URL to try out a new free voicemail service. The service is free, and it is very quick to sign up. Each signup will only need to input their email, cell number, carrier, and a pin that they create. We are looking for about 3000 signups in 2 months time. I am willing to pay a very good fee for successful completion of the project. Please have a proven track record. The payout will be in stages, as we have had some less than honest service providers get us on here prior. Here is how it will work. If you can provide the service, we will try a small sample run. You will refer 30 successful trials. If that happens we will immediately release $60 to you as a starter. We will then continue a payment schedule with bonuses for successful completion. If you can average 200 per week we will pay you $400 / week with a $100 bonus (total $500). Payments will be made escrowed at 2 weeks and payed at 30 days unless otherwise arranged. The 30 days for payment is necessary to make sure none of the trials are spam or gained through unethical ways. If the service provider can average 1500 users / month we will pay $3700. We are an honest service buyer. And if we find the right person for this relationship you could stand to make a significant income. I am looking for a long term relationship with someone reliable here. Best