I am so sorry Kmeb to find out that a so called doctor has put so much pressure on you, he must be a real piece of work, a scumbag comes to mind.
It seems its no different in your country as it is ours, 9 out of 10 insurance doctors are very willing to give false reports to get the extra money off the insurance companies.
I am so glad your own treating doctor is challenging his report, i am sure his word will help tremendously.
I have been through a battle with a very big insurance company over here, they know very well how much it could cost them to fight you, you have all the proof and all they have is lies and deception, i am sure you will be ok.
best wishes
Brian