Who called from 2087599577

I'm disabled and getting numerous nuisance calls from this number at awkward times. please help to find out where this call is originated, area eg east ham?

been called several times from the uk number 0208 759 9577, pls clarify whether this a call booth or a home number?

pls verify the source?

Message on answering machine of home phone telling me my one off charge was £15.99  I am in the UK and have never heard of this company!!! They left two messages saying the same thing, 5 minutes apart