In UK, the contract is between the buyer and the retailer, so thif there is a problem, the retailer is the first port of call.
The good companies will deal with the problem quickly and efficiently.,
The less scrupulous will try to fob you off to contact the manufacturer.
Often pointing out that the legally binding contract ios between then and you gets their attention.
“Breach of contract” suits, with Trading Standards on the case are not what a retailer wants!
If all else fails, find the name of the Chairman of the Board, and writing, marked “To be opened by addressee only” usually brings results.
It is often claimed that for every complaint to the manufacturer, mine others have been publicised to friends and associates.
A satisfied customer is a potent salesman.
Howard