Poor service from them,cannot even get to them telephonically

Two years ago I forfeited my voucher due to not being able to get through to them,by then I had only their number no email address,last year since August I've been trying to make a booking as my voucher is expiring this year in February, but you have to book two months before ,even today no one responded to my emails,telephonically is the worst,so that means I'm going to forfeit another voucher, please help me get my refund,I'm done with them!Their service is so poor l won't recommend anyone