Forget anything Mungall will tell you, in my opinion (and experience) it's all rubbish just to string you along and ride out the limitation period for legal action. I was operated on by Stefan Klopper and my vision now is awful, anything other than bright sunny daylight and it's bad, night time vision is like looking through a frosted glass window at best.
Take my advice, forget about any refund from OE, it won't happen and if they offer it then they are scared of the real cost to them, do what I have done, sever all ties with them completely and seek proper legal expert advice, I am currently in litigation with both OE and Stefan Klopper and have been for the last 20 months, i'm now at the point where we are about to serve court papers on them.
Remember this, to properly fix your eyes can cost A LOT of money! To fix my eyes it'll cost £15k, this is with a world renowned surgeon who actually knows what he is doing and acts with morals and integrity, unlike OE and Mr Klopper. The money for a repair can be factored into any compensation settlement so it really is the best way to proceed.
I know of multiple others who are also in litigation with Stefan Klopper, fact is the man is not a good surgeon!
My advice, take with a pinch of salt any reassurance David Mungall gives you
I have experience of the way this man works as he strung me along for years with false promises: he failed to tell me exactly what was the real cause of many of my problems, hiding this information to protect the surgeon.
Please don't be as trusting as I was, I would suggest you act swiftly.
Also keep in mind that David Mungall is OE's Customer Care Manager not even an optom!