If you ring the well known retailer to report a fault they divert you to the manufacturer and take no further responsibility.
Which says
If something is not of satisfactory quality, you have a statutory right under the Sale of Goods Act, to a refund, have it replaced or repaired for free.
You can ask the retailer to do either, but it can normally choose to do whichever would be cheapest.
If the retailer refuses to repair the faulty goods, you may have the right to arrange for someone else to repair them and claim compensation from the retailer for the cost of doing this.
If the retailer refuses to provide any remedy, such as replacing the item, you can either have your money back minus an amount for the use you’ve had of it, or keep the item and get a reduction on the price you paid.
If you’re having problems and the shop won’t repair or replace or replace your goods then it should be reported to your local Trading Standards department as they are breaching your statutory rights.
It’s worth telling the shop that you’re going to do this as this could mean your complaint is then dealt with.