HELOC Direct Mail Piece Follow Up Phone Calls

We currently have a promotion on HELOCs with a much lower rate than last year. As a part of the promotion, we sent out a direct mail piece to a special group of our current customers. Now we want to follow up this piece with a phone call to have another touch point with our customers to see a better ROI. By regulations standards, can we discuss the rate on the phone with the customers without have to say all of what is in the small print (what is printed in an ad)? What about if we leave a voice mail for the customer?