Support in English declined. How to get support (Prepaid number to a different provider)

Good Morning

• Is there any way of getting support in English by phone?
• If not, how I can cancel my contract with O2 and requesting to keep my current number when moving to another provider?
• Is there any way of raising a complaint in English? Or it must be done in German?

For whom  wanted to know why I am asking this:

I used the O2 help service  through My O2 app requesting a call back. In the comments I specified that I would need assistance in English in a very polite way . This not only did not happen, but also the woman “assisting ” me just repeated me “Kein English ” adding that they do not provide English support. She did not even try to redirect me to someone who could speak English, she did not even try to help, just to repeat that they do not provide English support and she just hang up. That was not only not supportive but extremely rude and unacceptable , therefore I am leaving O2.

Interestingly, I could get the contract speaking English, so when it is something related to me paying, then they can provide support in English, when it is me needing help, then they are rude.

Totally unacceptable.