Translation of insist in Spanish

We felt a little dumb and waited for the hot water. The boiler seemed not to work and we started to become upset. We asked the technician to come once again and he admitted his mistake.
I'm from Switzerland and I speak German as mother-language. I will try to help you to learn German! We speak French, Italian and German in our country. I heard that in the US Spanish is becoming more popular.
A band was playing Peruvian music while we were waiting for our luggage. The altitude is immediately felt: Dark blue skies and thin air, which won't let you climb stairs without having to take a few breaks.