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Depends what the item is, something simple like an egg timer or a felt tip pen, yeah easy to return/replace as theres not much you can do with it.
Appliances have their own bit of consumer law (usually helps consumers TBF) however this interval period between 4-5 weeks is where it goes from 'really sorry about that, heres another one fitted and replaced FOC ASAP' to 'well we'll schedule an engineer and see what they say, but chances are there is no spare parts available so you'll just have to keep the faulty appliance until we can get the £10 part to fix it, in the mean time we'll just keep you going in circles'
I've spoken to them (AO) this morning. It's just a really crap customer experience. It took about half an hour. I'm used to just getting replacements if things are broken (I guess due to Amazon), not having to constantly deal with people skipping responsibility. Trying to have a conversation about who's responsible for my case is incendiary because I don't care!
Instead I've had to be in a three way conference call with someone from AO and Beko, and when they started talking about "If this repair doesn't work, we'll get another engineer out to you to diagnose as soon as we can" had to tell them that I wasn't interested in that because "I know my consumer rights (thanks @Hefty) and that they've only got one go at repairing it"; I've never had to resort to that in my life.
They're inevitably going to end up replacing it because they sold it broken and have misdiagnosed the fault. It's just a load of timewasting, pointless faff, BS and loss goodwill up until that point.