New company problem

Hi all,

This is my first post on this forum & hopefully not the last.

I have just registered a firm for providing electrical service's to various clients.

As of now i have got a potential customer who is asking me for Service tax number,

As this is my first business , i came to know about Service tax threshold that i am eligible about and mentioned the same to the client. But the client is still requesting a Service Tax number for Vendor registration in his organization.

Please help me on what i should do....