Hi, thanks for the additional information and I can see how difficult this must have been for you.
However, a court is not going to order Npower to compensate you to the tune of £3,000 nor is a court going to write off a debt for gas and electricity that you have actually used. If you were allowed to do that there would be a flood of similar claims by disgruntled customers asking for their bills to be wiped clean. But also the energy has been used so it would be unfair not to pay for something that's been used.
The Ombudsman has given you a favourable decision - penalty charges have been removed, adverse records on your credit file have been removed and a payment plan has been put in place to pay the debt. This is in addition to the £200 you've been offered.
You do not have to accept this, of course, but you must remember that if you try and claim compensation through the court, there is no guarantee of success and you may end up paying substantial court fees and then be out of pocket.
So, to answer your question, the chance of taking nPower to court and receiving more compensation is extremely small in my opinion.