Dreams review: beds and mattresses

We've ordered a bed and a mattress from Dreams few weeks ago (Cost us £3100), and arrived only a less than week ago. But we are not happy with the bed as it is too high and not convenient to get in as I'm a short person. We tried a similar mattress on a different bed In the shop but didn't realise this bed frame was too high. We bought it without thinking too much because the shop assistant so keen to sell the beds for us gave us the confidence that if we are not happy with any of the products we will be able to return it within a time limit. But now the shop and the customer service are refusing for us to return or exchange it, according to their returns policy. Surely this is breaking the consumer rights law.