Help! Worktop Join

We have just had a large national company install a kitchen for us, including some solid oak worktops which we spent a bit of money on.

We are not happy with the join between the 2 worktops (pic attached). The worktop on the right is a breakfast bar and we believe it is therefore movable.

They have told us this was the only way to do the join and they couldn't do anything else. We are looking for a professional opinion as to whether there were any other options?

Thanks