how can i change the volume of the confirmation tones without using speakers with amplifiers?

i used 3 new batteries within 1.5 months. if I understand that correctly, the button should get by with a battery for about 1 year and longer.

The button is pressed twice a day. once to switch on the light in the evening and once to switch off when going to bed.
so i don't think that this is excessive use, which justifies such a high consumption of batteries

is there a technical problem (defect) or is it due to the "bad quality" of batteries? they were completely new and "durable" until the end of 2026. so not overlaid either.
what batteries (brand, type) can you recommend that last longer than two weeks and come close to the promised runtime?

I tried several times to reach support via the contact page on the internet but never get a answer.
I try the directly way over email...

no answer.

has support been discontinued or how can you imagine that?