Thanks for the help, I just had it fixed today. A technician came and sorted it out in no time. Just in case someone else has a similar problem, here’s what happened: it was just the coax connector was slightly damaged so there was no signal at the recorder. Now everything’s fine.
A bit of criticism though! The person who contacted me via email only told me to call again at the number above, get to anybody and ask in english, so didn’t really explain anything. I just tried for the Nth time and this time I got through (maybe other times it disconnected me because of too many lines occupied? still no idea because nobody will say!) and I got someone to whom I explained everything and after confirming there was no network problem from their side they told me a technician would contact me. They did almost immediately and arrived in the early morning to fix it right away, which I appreciate greatly. What I think could use some improvements is communication. The technical support via email did not address my problem at all, telling me to use the hotline without providing any explanation; I had to write a post here to then receive the same kind of reply a second time, and it was only after insisting over the telephone (without knowing what I was doing) that I got someone to fix my problem (which was solved VERY quickly!)
I think it really is a luxury to be able to communicate in English while still learning -at least one of- the national languages, so my sincerest thanks for that, but I also think that if there’s this possibility it’s a pity it’s not available in a better way; I do speak a little bit of French but to me this answering machine only spoke in German and none of the people that have contacted me via email have explained to me what to do; they just kept telling me to call that number as if that was my whole problem!
It is fantastic that I got it solved it in less than 12 hours, but being this effective is somewhat shadowed by the delay in being heard, due to this confusion not just about the language (which is perfectly understandable, like I said; I can’t expect people to talk to me in English) but about alternative means of communication that aren’t really that effective (like having a technical support online form that merely sends me to hotline), as it has been very frustrating having a problem and not knowing who to talk to.
In any case, everything’s fine now, so thanks again for everything!