Hi, I have some good news. I had the same problem with niusance calls from 08009121698 and I have managed to stop it and solve the problem. The company hiding under this number is TELEGEN UK. I simply send them an email saying that I want them to stop calling me and stating my mobile number. Ten minutes later the problem was solved as they suppresed my details and all the calls stopped. If you have same problem, please send an email to info@telegenuk.com.
Also I asked about how did they get my number and the answer from Lizzie Roberts (Project Manager @Telegen) is below:
'I have received a query regarding the phone calls you were receiving from DTD. Eurochance 100 is a Euro Millions lottery syndicate campaign. You data source was from one of our partner companies where you had entered into a competition either within a shopping centre or site marketing venue to win a Car or £500,000 and as a result your details where supplied to us to offer you this opportunity. Any further information you require please do not hesitate to contact me. I can confirm that your details have been suppressed and you will not be called by Telegen UK Ltd in future marketing campaigns'.
Good luck! Hope you will be as lucky as me.
Regards