About six months

About six months ago I had a sliver inlay on my first molar (lower right)on the NHS/semi private. Tonight the inside wall of the tooth has broken off, it is not sharp or painful. I was assured by my dentist at the time that this would not happen because of the bonding process used for inlays. What do I do now? Leave it? Go back? Find another dentist? Do I have any recourse as this was expensive treatment and I can’t afford to pay more to have the damage repaired. Thank you.