Child Support Agency claims over £71,000

The CSA are going to force me to pay back £71,000 they claim I owe, by selling the house I live in with my new partner, this September 2011

15 years ago, my then wife decided she would up sticks, take my two children with her, and go to the far north of Scotland to live with her brother.

We had negative equity on our flat we had on mortgage, then I was made redundant, and ultimatley I lost the flat.

I lived rough after that, working for food on local farms, odd jobbing here and there. Eventually after sleeping in the car one night, I woke to four feet of snow up against the car, and thought enough was enough, so I headed for my parents home, who put me up for a year or so, in which time I found a job, and met a new lovely partner.

She too had a troublesome marraige, her husband slept around, so they divorced a couple of years before I met her. She was on benefits with two teenage children, so when we met, she got a job full time, and we managed to struggle back to a basic way of life. Now here I am, and the CSA claim I owe them £71,000 and ticking since 2001. How on earth they have reached this figure I do not begin to understand, and I know I have never earnt more than £15,000 gross in a year until very recently. So why the large amount? I have written to them so many times, and asked to be reassesed, but to no avail. I do not know what to do, now the cjhildren have left, my lovely partner will lose her home of 30 years if the CSA have their way. Please, somebody help, I am desperate for some sense, and cannot see a way out other than described at the beginning of my letter