Bought a used iPhone and it has Activation Lock.

some one sold me this in 500 pounds and then it locked in couple of days

Ask your money back.

See -> How to remove Activation Lock

How to remove Activation Lock – Apple Support (UK)

-> If you need help with removing Activation Lock and have proof of purchase documentation, you can start an Activation Lock support request.

omair65 wrote:

he ran out

You got scammed.

Your options here are limited to filing a civil case, assuming you can even find the seller.

We can't help bypass Activation Lock here, and Apple won't.

The All Too Common SAD Reality of Buying a used iPad/iPhone - Apple Community

Then you were scammed and out of the money you spent. Again, there is nothing we, nor Apple, can do to help you with this. You will need to work with your local law enforcement agency to try to get this resolved.

Review the Apple Support article you came here from for what to do in this case.

Ref: Return a lost, locked iPhone

Return it to whoever sold it to you for a refund.

There is nothing we or Apple can do for you.