tesco's shopper thoughts panel

Hello. Not totally sure if this is the right place but seems close as anything! Has anyone managed to get a response out of Shopperthoughts on any subject? Back in the day I got onto the Shopperthoughts panel and received surveys. Recently I realised I'd not had any for a long time. I tried to log in but got a message that the account was inactive. There was no explanation beyond that. I understand the Ts and Cs; if they think you abuse it then you'll get blocked and receive no further communication. In my case, though, I did not abuse it. I always answered honestly after reading the questions. I can recall one where I did answer middling responses an awful lot because those were the answers I needed to give; I was getting asked questions about a subject where I'd never said I had any interest. I spotted the quality control questions and answered those correctly, though. Anyway, I have written an e-mail a couple of times with no response and have tried to re-register but nothing's come through. I can only presume their system blacklisted my Clubcard number. Has anyone had any success in contacting them? On this or indeed any other subject? Cheers, Richard.