Ayto, take heart mate. It could always be worse.
For the first 7 years post-separation, the CSA was calculating my Child Support based on the information provided by my ex-, that I had zero contact with my daughter. At that stage, it was in fact alternate weekends and a couple of hours on a Tuesday afternoon.
Once I discovered I'd probably "overpaid" around $20k aftertax dollars, I asked the CSA if there was anything I could do about re-adjusting the balance? Of course, if I had "underpaid" they would have insisted I made up the shortfall, however, they said there was nothing I could do about paying too much. LOL.
Don't give up hope that someday things may get better.
Miss 12yo cut me off in 2011, and wouldn't have any form of communication with me for a bit over 5 years.
Then, out of the blue I got a phone call from her in Port Mac last year, and we speak on the phone and Facebook every week or so, and catch up for lunch every month or so.
I was a bitter, angry man ( internally, at least) for a long time and my lovely, new wife couldn't ever get me talk about my feelings with regard to my daughter. Eventually, I just managed to stop letting it hurt me so much, and got on with "Living in the Moment".
The next stage will be trying to re-integrate my daughter with my "new" family and my parents ( she is the only granddaughter).
One day at a time.
Keep up the good fight. If nothing else,always be true to yourself.