The store should not be sending you anything anyway; it should be from the house holder or their insurers or the stores insurers
This is not uncommon now with claims on the increase, the insurance companies try to recover costs were ever they can
If they can get a quick, cost effective settlement to help towards the erosion of their profits, they will
If you have liability insurance, you should inform them of the claim and they will ask you for a report and will deal with situation
If you have received a letter from the store its self and do not have liability insurance, you may think an idea just to ignore it for now, if not recorded, as it may be someone at the store fishing, trying to cover their bum, as said looking for a mug to sort out their mess, I find it so easy when you are dashing about to loose letters
If letter recorded, be firm in your reply, state works done correctly at time, do not ask for any information or give any more information at this time, You can seek legal advise if you wish, try to find a solicitor who gives first hour advise or join an trade body that gives access to limited free legal advise
At this stage let them do the running and don’t dive in, thinking you are doing the right thing, you will find lots of sharks waiting for you
The above is just some thoughts out loud; remember you should always take qualified advice
🙂