Well, for starters, "you get what you paid for" is not a condemnation of your circumstances, it is a general comment that the more you pay, generally speaking, you'll get better quality. It's not a reflecection on the buyer, but a reflection on consumer life itself.
14 months is not suitable length of time, you are quite right.
As a matter of curiosity, what is the reasoning being given for the policy being mis-sold? Have you checked the T&Cs yourself and does it in fact state that only parts of the sofas are covered?
The way I see it, with the limited info you have given, these are the possibilities:
- The guy who sold you the policy told you you were covered for everything, but the policy has exclusions: Mis-selling. You go for refund of mis-sold policy and use SOGA 1979 to get your sofa sorted, and possibly complain to the OFT under the new CPUT 2008 for LoL unfair practices.
- The policy does in fact cover for everything, and the insurance are trying it on: You insist the insurance sort it out and pays for repairs.
What you must not let them do is pass you from pillar to post, which looks like that's what they're doing.
Do you have the copy of your insurance policy? Instead of listening to them arguing back and forth, read it and see what it says, it will give you the direction in which to go. If you don't have a copy, get one.
Let us know what comes out, and we'll help you take it from there.

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