Paid but no phone

I sent my iPhone to these guys for repair. The quoted me a price which i agreed to. They then told me to deposit the money before the send the phone back after they repaired it. I deposited the money and 2 weeks later no phone. I called them back and they told me that it will cost a further 399 ex vat for a new battery as the battery is also faulty to which i told them that my battery was replaced before already. Told them to send back my phone but still no phone. Now i am out of pocket and no phone either.