Can anyone share experience about marketing campaigns launched for your's or your clients product and being able to generate leads out of it?

I will share one of mine to start, this is a campaign that we launched for one of our clients 

Client - Dental Practice

Location - New Jersey

Campaign Name - Dental benefit card

Budget - $200

Duration - 90 days

Objective - to increase appointment by 20%

Channel - Multichannel 

The client is one of the dental practices based in New Jersey, With an average of monthly 150 appointments, average fee per appointment  being $100. Objective was to increase the appointments by 20%. Channels used were Facebook ads, Google adwords and Telemarketing. Target area was 5 km around the practice location. Campaign offering customers a free dental benefit card which would provide a free consultation with appointments. 11 new appointments were made within 30 days. and a total of new 38 appointments from this campaign. And on an average $3800 increase from one campaign.