Help for a family to be together

Hi my name is Reagan im a 29 yo male from australia, 4 years ago i met a girl on the internet after 3 years of being in a very close relationship though on the internet with a girl in the united kingdom we got engaged almost 3 years ago to this day we finally saved enough money for me to go and see her in the uk when i got there they asked why i was visiting i told them i was in a relationship with a girl there and i was engaged to her and asked for a 6 month visa they told me i couldnt get it as i was at a risk of overstaying any visa and i was granted temperary admission for 2 days then i was deported back to australia needless to stay this upset us both greatly and weve cryed alot of tears, especially because we have 3 kids involved that are biolodgicaly my partners the yougest is only 4 years old and ive been there for her as her dad across the internet almost her whole life witch makes it even harder for her because im the only father shes ever known and all we wanted to do was see eachother for the first time as a family.

Basically at this point were at a complete loss because all we want to do is find a way to be together and without the money for a laywer(possible human rights case if we could afford one) and/or $15,000 for a partrner visa because i have to show i can support myself for the next two years in the UK. please help us to be together as a family and any help would be forever greatful for and so will my fiance and children.