Poor Hyperli Customer service

Purchased a voucher, couldn't make it, tried to get a refund, this was rejected on the basis that vouchers need to be refunded within their prescribed period which I completely understand, ask them to at least extend the voucher for an additional month, to date no response despite several emails being sent to their support email address. There is no number to call only an email address. My question is if there is no refund option and a voucher cannot be extended, Hyperli is taking the customers money without any reward to the customer or service provider. I will never ever use them again and have unsubscribed to their email deals. Their product offerings have not changed since I started using them so it's really no loss to no longer be receiving their deals. The customer service is also very weak and they lack prompt customer feedback.