For all that's holy, can you just leverage the Web, please?

Summary

When I moved in with my wife Laura in 2005, we lived in a shared apartment in Barcelona that had an ancient washing machine that was just there already, no idea who initially bought it. I managed to break the washing machine door's closing mechanism some time in 2006, so for a few weeks, whenever we did the washing, we had to lean a chair against the door so it wouldn't open. At the time, we were both students and living on a small budget.Eventually, later in the same year, we bought an Electrolux machine that has accompanied us ever since. First on our move to Hamburg, then there through three apartments, and finally back to Spain, where we live now in the Catalonian countryside. Anyway, the washing machine had a motor damage last week, so after almost 20 years, it was time for a new one. I ordered it online (another Electrolux, without Internet nor WiFi), it was delivered swiftly, and I installed it hopefully correctly.The washing machine came with a voluntary 10 year warranty if you registered it. The brochure where this offer was announced featured a free telephone number and a QR code that pointed at the number (in plain text, not making use of the tel: protocol). I called the number, and to my absolute surprise there were currently more callers than usual. After about 20 minutes, I had an agent on the phone, but after saying what I wanted, they just hung up on me (or the connection cut, whatever). Fine, I called again, but now, the call center was over capacity and they didn't even let me enter in the wait loop.They did offer to send me a link to a chat service on their website via SMS, though, so I went for that option. The SMS literally pointed me at something like https://www. broken up by a space and then example.com/gc/. When I clicked the linkified example.com/gc/, I ended up on a broken site whose certificate wasn't trusted. After fixing the link manually and prepending the https://www. part, the page didn't load.At this point I was close to giving up, ...