Non delivery of goods - cancellation charges

I have placed an order through my business for office furniture six weeks ago. The emailed order stated delivery between 7 - 10 days. However I was advised when I phoned that the factory who was to make up the furniture was closing down for two weeks and there would be a delay. I was advised delivery would be before date 24th Aug (six weeks after order) and I asked for as much notice as possible.

I have made three calls in total over past week and was advised they were chasing but I subsequently tried to cancel order today. I was told that the verbal delivery-by date was an estimate and I should expect two days either side. Also advised that the items were being made to order and now I must pay 20% cancellation charge. This charge is in the terms and conditions on the company website but if the original emailed order states 7 - 12 days do I have any rights?

Would be very grateful for advise. Many thanks