Ashmess,
keep calm!
I'm from Germany and I also got E-Mails from these solicitors and was in panic, too. They (also their "customer") tried to call me, too... I contacted my solicitor for this case and had no direct contact with the opposite side (no E-Mails, no phone calls).
My solicitor said that E-Mails aren't worth anything, but he began to contact the opposite side with denying the accusation of using pirated software. At the end they showed their recordings (list with my MAC-Address, type and version of software, usage time) and my solicitor was denyin