Do you have proof of your payment to them initially?
What do you have by way of proof stating they will refund you the money?
What is the value of the monies owed?
Did you purchase as a consumer?
Write them a final letter sent by registered post entitled "Letter before Intended Legal Proceedings". Refer to the transaction and your subsequent correspondence, proof of payment, your assertion that the goods have not been delivered within a reasonable time, proof of their statement to refund and state that if you do not receive a cheque in the sum owed made payable to you within 14 days of the date of the letter then you shall issue a claim against them for the monies and your costs.
If they do not pay then you can issue a claim for the money yourself through Her Majesty Courts Service's online service: http://www.moneyclaim.gov.uk/. It's very straight forward and easy to use.
Open a file, send the letter by registered post, keep copies of everything for use in any claim you may choose to issue at a later date.
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