I think this is a good example of where it would be appropriate to write a letter to the GM of the property explaining that you had a nice stay, but pointing out that there are apparently some glitches with their wake-up call system. Don't ask for compensation, but just send it in the spirit of helping the manager run a better hotel. Who knows--you may get some points or a free night certificate or something as a thank-you (but I agree with others here that EXPECTING compensation for this situation is gauche).