I bought some phone cases from dhgate a while ago and started selling them on eBay. I was naive to think I wouldn't run into problems selling branded products. After listing around around 15 auctions for the cases, 2 sold for around £10 each and 13 were removed for trademark violation. After that happened, I took it as a warning and never sold any branded stuff again on eBay. 1 month later, I receive a letter in the post addressed to myself stating that I have violated the company's trademark. The letter was not sent by signed for post, just 1st class. The letter looks real and it's from a reputable law company. I've checked the details on the letter and, as far as I can tell, it is real. In the letter, it states that I must pay £350 in legal fees (for sending a letter..?) and compensation on top of that. No figure is stated for the amount of compensation I have to pay. My questions are: 1) Should I respond to the letter? 2) Should I seek professional legal advice? 3) How much is the compensation likely to be? Thanks for the help.