Absolutely appalling scam of a company.
Take you money for 3 months, change delivery date 3 times then cancel your order with no explanation beyond an email saying if you want it, buy it again from the website, where it is now £100 more expensive. Oh and they've had your money for 3 months, and will still take 2 weeks to give it back to you.
Contact them, and they do nothing. Just tell you that you have to reorder at the new price. No attempt to remedy, no goodwill, no understanding of customer service.
Will never do business with them again and I suggest you don't either.