Wait for CA advice really but imo I don't think they will say much, but I can tell you from experience you are not the first or last that will sadly go round in circles. Staff do sometimes (not just knowhow) tell you what you need to hear over the phone sadly just to get rid of you. Its not right or fair for sure, if you can get someone more senior (manager or team leaders) and try and get them to email you what they said in writing its always better in black and white but not always. Sometimes you can write a letter directly to head office complaints department and it can be handled better also.
Some resort to public outcry on twitter or facebook, sometimes you have to catch the attention of someone decent or someone who can make the right decisions.
Yes Currys should not really be selling plans which promise 7 day repair promise, it should have been updated properly but we are in the middle of the worst world changing event ever also.
Usually if a manufacturer or retailer can't repair the goods within a reasonable amount of time, its a more direct case and cause to write it off or exchange it etc
But reasonable amount of time varies company to company, you may wish to ask knowhow on chat or email and get it in writing ? Or check the TnC leaflet or website.
Either way I think its somewhere around 28 days to 6 weeks (off the top of my head) and it also depends if its in the first year or 2nd year+ from your purchase date. If its in the first year its generally 28 days, 2nd year + it can be 6 weeks (rough times)
Still again you need to double check the above that's just a rough ball mark from my experience and naturally, what they say is not always 100% right during these Covid times.
My point is, if its gone too long with out repair about 30-45 days, then its only fair a company should write it off no one should really wait 7-8 weeks for a repair of a product. I suspect with lock down and covid though this may unofficially bump up more.
Also this site is handy with legalities and has a free resolver tool
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www.resolver.co.uk