What do I do ?

Hi, 

my son has been gambling for 14 years. We have bailed him out numerous times. Once by paying a loan shark. 
a few weeks he went missing for the night but came back in the morning. We finally managed to drag it out of him that he was in debt. First he said £1500. 
which didn’t sound bad enough to do what he did. 
he’s since joined an online support group and has done two sessions over the past two weeks, which he said has really helped him. He’s since told us that he owes £5000 to some bloke, I suspect another loan shark but he won’t admit it. 
he’s looking for someone to get a loan for him and he’s gonna get his wages paid in to that persons bank so they can guarantee he will pay it. 
we’ve got the funds to help him. My husband says it won’t solve the problem and he will keep on doing it, and refuses and I want to do it. It’s the first time he’s actually got help for his gambling so I feel like it’s a step forward. 
Any advice please I’m so desperate to help him.