Hey, I was in a bit of a rush doing an oil change and didn't completely wait for the last dribbles of oil to drain out before replacing the bolt. Although the bolt feels tight now, I've now got an oil leak which I didn't have before

I think I must have threaded where the bolt goes in.
Is this fixable and if so roughtly how much can I expect to pay and where should I take it?
Cheers
Eddie