PORTLAND, Maine — Consumers love coupons. Research shows more than 70 percent of us use them. But several Portland business owners say they’re confused about coupons being offered to their stores; they tell CBS 13 they never signed up to offer the deals.

The owner of a downtown business called CBS 13’s tip line saying there are coupons out there offering 20 percent off at her store, but she says the coupons aren’t coming from her, and unfortunately, due to the nature of her business, she can’t even honor them.

For almost two decades, Rita Farley has run Encore on Congress Street in Portland. She says she’s never offered coupons.

“Certainly for this store it would be an impossibility. We do a lot of consignment; you can’t just [offer] 20 percent off somebody’s stuff,” Farley said.

But that’s what she found on AARP’s Rewards for Good website. The program gives coupons when people use features on the site like the “Money Saving Skills Quiz” or the Social Security tool. When Farley turned 65, she started poking around on the site and found the coupon for her store.

CBS 13 Investigates started making calls and sending emails to get some answers. A spokesman for AARP says the program is powered by Entertainment Promotions. The same company prints and sells coupon books. There’s a coupon for Encore in there, too.

We also visited several other Portland businesses in the book and on the Rewards for Good site, including Mainely Frames, East End Cupcakes and Holy Donut. Like Farley, they all say they didn’t agree to offer the discounts and it’s a mystery how the coupons for their businesses ended up in the book.

Entertainment Promotions lawyer Robert Lapidus wrote in an email to CBS 13 that they have valid advertising agreements with the merchants in question. So we worked with Farley to get that contract.

“It didn’t have anything on it; they had my name typed in but nothing signed. First they said I signed it, then they said I answered it over the phone. That’s the latest: That I OK’d it in a telephone call,” Farley said.

Lapidus told us the company used to allow local sales reps to get oral consent from merchants but those “signing procedures in the past are no longer followed now.” Electronic or written signatures are required.

“We do not intentionally publish discount promotions in any of our publications without a valid contract, although with well over 100,000 local merchants throughout the country, it is possible that we can make a mistake,” Lapidus said.

Entertainment Promotions says it will remove the businesses from its online offers. The company also promised to investigate internally how those businesses ended up in the program to start with.

The merchants we talked with say they apologize, but they can’t accept the coupons in the Entertainment book or on AARP’s website.

If you bought one of these books and have trouble redeeming the coupons, you can give the company a call at 1-888-231-7283.