Wish I could give less than 1

Wish I could give less than 1! My son bought us a $100 gift certificate in May. We tried to use it but an error message came up saying the number was invalid. He made a phone call and was told it would now work. I tried to use it today, 7 months later, and got the same error message. I contacted customer service to cancel my membership (which you have to set up and include credit card information in order to order). They supposedly canceled. We shall see. There was no apology; no effort to look into it or make it right. I’d never use this company and I would never ever buy anyone a gift card. Worst customer service I’ve had from a company in ages.