Residential Litigation Group said they had a class action law suit against wells fargo and could help save my home but I had to pay Washington, Washington DC

I was looking for someone to help me for the second time after being scammed once to help me remodify my mortage with Wells Fargo after waiting for them for over a year to do it also after two attempts. So I looked for companies on the internet and found Residential Litigation Group . They contacted me via email and then by phone and sent me documents to sign after getting all of my personal information ss#,banking information etc. They had me electronically sign documents and I did without thinking and they said they would start taking $1200 a month out until a total of $6000 is paid but at the end of the law suit I would get it back. Now they called me today 1/14/13 and said he was an attorney so we could discuss our agreement but I said I could not talk . He said he would call back on 1/15/13 at 12:00. I want to cancel the contract but don"t know if I can so I am going to notify my bank so they cannot draw out any money on the 25th of every month. I hope I can do this. In the meantime I don't know what is going on with my mortage and I need to know who can help me with this problem. The first people that scammed me got $1500 they were Top Legal Advocates and I cannot get in touch with them. They will not return my calls and I would like my money refunded.