Waterstones online appalling

Been unable to buy digital books online with Waterstones for months due to their sites inability to take Barclays debit or credit cards.
After numerous phone calls to my bank and Barclaycard - I eventually find out it is Waterstones issue. If they had replied to any of my emails or calls to customer service, I wouldn't have wasted the hours that I did.

Eventually I got a reply from my 5th email to tell me that it was their fault and they couldn't take Barclays cards. The good news was that this would soon be sorted.
However after 6 months it wasn't sorted. Eventually after 9 months it worked. Hallelujah! Great news.
And then a new site, even better - but hold on Barclays cards don't work again.

I've emailed customer services for an answer and once again no reply - despite an acknowledgement tells ng me I would get an answer in 72 hours.

Cowboy company with IT people that would struggle with an abacus