The person would not answer when I picked up but I could hear a Chinese man talking in background noise and when you call back, the number is not in service!

Dont answer when they call suspect scam

Called me today on mobile, silence for a few seconds, then they hung up. Obviously a call of type; spam, robot, call-centre.

caller very abusive. I rang back and number not in service. How do I stop these callers?

Yes, definitely a spam scam to do with trading (don't know what kind & don't want to know). Asked them to take my name off their list over 6 months when they called and they have tried it again 3 more times within that 6 months, would appreciate it if anyone can list their company name or address/phone details so that I can contact them or place a complaint with the Ombudsman, thanks.

call it back and it says number not in service

I called back number (02) 8073 4482 it says the number I have dialed is not in service anymore.

Called number back said number not in service. Obviously a scam

would not answer and when you call back, the number is not in service!