Anyone use a free lesson coupon at PGA Superstore? What about two?

I got two free lesson coupons from a hut at PGA Superstore awhile back. I used one 6 months ago or longer. I just read the back of the card and it says one per customer. Worried that they might want to charge me full price. My free iron lesson was not worth $80. I was wondering if anyone out there has been in a similar situation. Thanks in advance.