Wedding suit problems 6 days before wedding.

Hi.
I’m getting married on Monday 19th.
I was measured up & paid for a suit on 23rd October from A Suit That Fits, the Birmingham branch. I paid on visa debit, £900. I had the first fitting November 16th. The trousers didn’t fit well at all. I was told to rearrange at the end of January in case of any weight being gained over the Christmas period. I didn’t gain or lose any weight. I called back but the lady who had measured me had left the company. They couldn’t fit me in until the 15th of February because another member of staff had left, they were now operating once a week in Birmingham instead of 5 days a week. Another lady measured me up again & said the trousers would have to be remade because they were too far out. Assured me they would be done as a priority & guaranteed one or two more fittings before the wedding. After many phone calls, on Friday afternoon they called & asked me to come to London on Monday morning, which was out of the question because of work. They said they were 95% sure they would fit & posted them out. I received them today & they are worse than the original ones, ill fitting, baggy & short. I’ve sent photos via email & I’m waiting for a manager to ring me. The wedding is in 6 days so there is nothing they can do anyway. Am I in my rights to ask for a full refund since the suit was specifically for this event & they had 5 months to have it fitted properly?
Any advice would be appreciated.