For what it's worth, I've been waiting 4 WEEKS for a reply from this 'mythical' 'executive team' that Lutz Schueler refers to...
Sent another letter of complaint just over a week ago, and not even had a reply to that one!!! so I wouldn't hold your breath....
Basically, they are not interested, from the CEO downwards, zero interest, once they have your name on the contract, you are no longer of any use to them, so they just ignore you, or..send out these letters promising someone will be in touch, but nobody ever is..Much like the mythical 'someone will call you back in the next 48 hours' which is used by the 'customer service' operators to basically get rid of you off the phone...no more...no less...