Can anyone advice on what other number to possibly call aside from the 0300 Number, I did not take a copy of my passport application number on the phone and its now been 6 weeks since I applied and the 0300 line couldn't help me but told me someone will call me back but nothing yet. My timeline sho...

I am desperate for an advice
I had my interview 10 days ago in london Victoria and nothing since

I called the 0300 number and they can not find anything at all about me
Before the interview I received my supporting docs but nothing since

What could be going wrong ?