the mietminderung is your strongest move, and you don't need a lawyer to start it. just write a formal letter (in german, but deepl or a friend can help) stating the issue, the date it started, and that you're reducing rent by 15% until it's fixed. put it in writing, keep a copy. they have to respond or they're accepting the reduction by default after a few months

also, if you're in a newer building near alexanderplatz or mitte, the wiring might be the issue - old coax in the walls that can't handle modern speeds. that's the landlord's problem to fix, not vodafone's. a lot of these post-2000 buildings have cheap internal cabling that falls apart

for immediate work, get a prepaid sim with unlimited data from congstar or fraenk for like 25 euro a month, no contract. use your phone as a hotspot. it's not ideal but it keeps you online while you fight this. then deduct that cost from the rent too

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yeah so the thing is, if internet is in your rental contract as a service the landlord has to provide, they're failing at that. you can absolutely push for a rent reduction (Mietminderung) and honestly 10-20% is not crazy for something that cuts out every 10 minutes. join the Berliner Mieterverein or similar tenant association, they'll handle the legal letter for like 60 euros a year and it's way easier than trying to navigate this solo in german

also don't let them tell you not to contact Vodafone. that's their convenience talking, not your problem. you're the one paying for it indirectly through rent, you have every right to file a Störungsmeldung yourself. if the line is actually broken and not a building wiring issue, Vodafone will send a tech and the landlord can't stop that

if you're really stuck and need internet for work, consider getting your own 5G router from O2 or Telekom as a backup. it's like 30-40 a month and you can cancel anytime. then invoice the landlord for the cost as part of your Mietminderung argument, because you're having to pay for a service they promised to provide

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Honestly, the easiest first step is to just call Vodafone yourself and report the fault as a tenant. You don't need the landlord's permission for that, and they can't stop you. If the building wiring is actually the problem, the technician will see it and note it, which gives you solid proof for the rent reduction letter.

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