Skydriller,
This is, unfortunately, symptomatic of a little knowledge is a dangerous thing. The flight may well have been delayed by a technical fault. However, generally, most small snags are easy and quick to fix if not even put into the acceptable deferred defaults list.
If you miss your departure slot, which ties in with your cross Europe flight plan slot, then you need to request another. This can take hours! A likely explanation as to why you were given 2 'different' answers to the delay is that the CC aren't really that interested in what was fixed, they will be interested in when they go off duty and the ATC slot delay will affect that more. They understand 'Slot Delays' far more than 'the AI was broken' and will communicate that with you. Sad but true.