I don't think phoning up will achieve anything. But if you have nothing better to do then...........
Before I got the new epg trying to access VOD crashed the box. After the epg update I got the error messages you are getting. I found that if you persist, maybe up to 7 or 8 times, in OK'ing out of the error and trying again, eventually you will connect with the VOD server and get your program.
At that time I found that FF would not work and you could not get back into the program if you tried it. A soft box reset would fix that one.
I also depressingly found that the errors could crop up mid way through your viewing, you could always go through the whole process again? But with FF not working........
Very often a Hard box reset would be necessary after a VOD session (sucessfull one or not) or you would only be left with a now/next epg and be plagued with the "we are altering some settings so you cant use your remote. Please press OK to remove this message" nonsense.
Good luck with it.