Port in not worked and frustrated with terrible service.

I ported my number from O2 a week ago, but it doesn't work - I am unable to make or receive calls or texts. More concerningly, I phoned my own number and somebody else answered - somebody I don't know.
I keep getting fobbed off that it will be resolved in 24 hours, or that somebody will get in touch with me - nothing. I am so angry and frustrated. Having no phone is affecting my work and my children cannot contact me if I am out of a wifi range.
I just cannot get answered and told that transferring to a manager or the complaints department is not an option.
Can anyone give any advice please?

I encountered the same situation. I also ported my number from O2 to Lebara few days ago.
The agents keep telling me the bull**** and I have no mobile service for more than 3 days.

management email [email protected]
Head office email address [email protected]
they to have a habit of not telling the truth or not interested in helping at times there customer service