Must say thanks for presenting every eventuality. We'd like to hope truth prevails but it doesn't always, so it's best to be prepared for every defense they may present.
In my experience (I've dealt with customer services of BA, EK and EY) the airlines don't tend to try and make out that you're lying (maybe because I never was and am not now either) but they will try to negate their responsibility.
BA almost lied themselves when I claimed for a delayed flight they said it was ten minutes under the EU middle threshold so paid the lower level specified, but they still compensated according to the lower EU threshold and for a taxi home because the person picking me up couldn't at the delayed time. A cheque came promptly.
With EK it was a service issue, and they 'promised' to rectify. Sure enough I was upgraded from J to F on my next three flights. A bit intangible but they did make good on their promise.
With EY they flat out to give monetary compensation for something they a) know is their fault and b) can only really be fixed with monetary compensation. They did give a bucket load of miles though which was enough for an upgrade again from J to F on a 7 hour flight.

SWISS are the first airline to not respond for such a long time, so whilst I am concerned I feel they might wake up when my card company reverses the charge on them.

Oh and I'm not a serial complainer I promise, when you fly long haul four times a month issues are bound to arise once in a while. The SWISS mishap described in this thread has to be the worst thing I've experienced to date and to be honest the other issues I have complained about seem insignificant after this!