Hi Lazyhampster,
Welcome to the forum. You will find this place is a very accepting and nonjudgmental space.
Alas there are no consequences that I know of for venues to fail to uphold the self exclusion policy. Hence if someone is determined to gamble they can find a way around the self exclusion policy. If someone really want to quit then they can use self exclusion as a helpful tool. They can go to venues after they gamble and remind the staff that they have been excluded for example. Extremely useful for those motivated to quit, useless for those unmotivated to change.
The easiest way to organize Gambling counselling is to give Gamblers Helpline a call (1800 858 858, 24 hours a day, 7 days a week). They have access to a database with all the gambling counselling services and can get you contact details for your nearest service. If your partner wants help more often than once a week he is welcome to call Gamblers Helpline as often as he wants, he can call 50 times in a week if he wants.
Sometimes gamblers will seek out help so that other people will stop bugging them rather than because they actually want it. If that is the case then all you can do is talk to a counselor yourself, they are likely to know a few motivation enhancing strategies that you might not have though of.
From a more practical point of view it sounds like you are really in some financial trouble. The financial counselling Hotline should be able to help you with that. Then have some powers that banks don't and are often able to help people out of really difficult situations. Call them 9--5 Mon-Fri (1800 007 007).
You also mentioned that you are at risk of homelessness. My heart goes out to you, i can only imagine what that must feel like. But again from a practical perspective impending homelessness is something that you should prepare for in advance. Homeless shelters book out in advance so it is important to get in early. You can find more information regarding emergency housing in ACT Here
https://www.act.gov.au/browse/topics/land-building-and-housing/emergency-accommodation You have lots of challenges ahead, a gambling counselor will hopefully be able to help you with them all.
I know things seem desperate now, but many people on this forum have been in your position and worse and lived to tell the tail. Have a read through the forums, talk to some members and see what people in similar situations have found helpful.
You have a difficult road to walk, but you don't have to walk it alone.