So I did some work for a returning client. Always been fine in the past, paid on time ect. This time, they still haven't paid their invoice. I sent a reminder, but it came back as no longer at this address. Only have a mobile number, which they've either changed or are just not answering. I've never dealt with this before as I've been very lucky. Not sure if I can take it to small claims or if I need to try another avenue. If anyone can give me any advice it'd be very much appreciated. Tia