Not honouring paid for voucher

My son bought me a Signature nail bar and beauty voucher for my birthday. I emailed Signature salon on 27 October to try and make a booking, No response from them. I called them today (6 Nov) to make a booking and was informed that they are NOT honouring the paid for voucher as they having an issue with Hyperli. I was told to contact Hyperli and get a refund. no apology or reason why they never responded to my mail. When I asked them why they were not honouring the voucher they responded just contact Hyperli to get your money back - so disappointed