Ruined our christmas

As four family members we made payments from February 2017, when our vouchers finally arrived mid November
We was shocked to find had only been sent £641, we was expecting over £2000. Called customer service who said they had no idea why this had happened but all she could do was have a cheque sent out for £217 and have remaining vouchers sent but probably wouldn’t arrive before Christmas. Cheque arrived mid December but as of today, 8th Jan 2018, still no vouchers!!
Thought saving with Park would ease the Christmas stress but I couldn’t have been more wrong. I would expect a better service from a long running company. It’s been a very stressful and disappointing experience, that I wouldn’t recommend to anyone.