Best answer by stephenrand
As this is your first post, welcome to the community!
Everything you need to know about vouchers you should find in this link
Worth checking your email spam - otherwise it tells you how to contact Pure Planet via Wattbot.
Hope that helps. It might not, because I've not come across the £30 after three months offer, so if necessary do ask again, there's plenty of fellow customers here who are happy to help - or contact Pure Planet via Wattbot
Best of luck