[Your address]
[Company/ supplier address]
Dear Sir/Madam,
[Reference: contract number]
On [date] I [bought/placed an order for] a [item].
I did not receive the item and on contacting you I was advised that the delivery driver had left the item [with a neighbour] [add details of location item was left].
[If your order was made after 1 October 2015] Under the Consumer Rights Act the goods remain at your risk until they are received by me and I would request that you now make arrangements for the [item] to be delivered to me without delay and would request that you confirm that you will do this by return.
[OR]
[If your order was made before 1 October 2015] Under the Sale of Goods Act 1979 the goods remain at your risk until they are received by me and I would request that you now make arrangements for the [item] to be delivered to me without delay and would request that you confirm that you will do this by return.
Yours sincerely
[Your name]