The Bitcoin gift certificate seller Gyft is in hot water after Amazon appeared to ban a customer for using one of its products.

Reddit user u/BitcoinUser4040 posted material Tuesday confirming Amazon’s move to block their account for “submitting invalid gift cards as payment for orders.” Account

Calls for Gyft founder Vinny Lingham to respond to the growing topic on the social media site have so far gone unanswered.

Meanwhile, the company wrote on Twitter that the user should contact them separately, adding that Amazon “closes accts @ (sic) their own discretion.”

The debacle was unleashed due primarily to Gyft’s terms and conditions relating to the sale of its certificates, which are paid for with Bitcoin and then spendable on Amazon’s website like a regular Amazon gift card.

Following the account suspension, the user received confirmation that the purchase was non-refundable.

“We are so sorry but gift cards sales are final sale. Unfortunately, we cannot refund a gift card once the code has been revealed,” a message from a Gyft customer service representative continued.

“You will need to contact Amazon directly if they have closed your Amazon account. Since you are the owner of the account and the gift cards, they will be able to provide you with more information.”

Gyft has previously seen considerable success in its market, remaining arguably the most comprehensive provider of Bitcoin-based gift certificates.