I would try telling 'Simply' that the problem is theirs - as supplier.
Quote the Sale of Goods Act 1979 (as amended).
Your contract is with Simply, not Acer, and if the goods are not fit for the purpose sold then it is up to Simply to sort matters out with Acer.
Do not be fobbed off with "It's the Manufacturer's warranty..." etc. Simply tried this with me over a faulty printer, but I threatened to take Simply to the Small Claims Court, and the item was replaced the following day!