Anyone heard of or dealt with Associated Credit Services?

A little over 2 years ago I made the mistake of taking out a private student loan, my first and worst mistake. I was not able to make payments and now it is with a collection agency...Associated Credit Services. I do not trust this company at all. Every time I speak with one of their employees I get a different story and it really concerns me.

One rep was willing to accept a partial payment of $300, he asked for my debit cardt #, and even though I was hesitant I gave it to him. This same rep told me to never give anyone my bank acct. info because then that could cause even more trouble for me. He was very ademant about this. He was trying to say he was on my side and he would work with me, that he was a senior rep and he supposedly told me things 'in confidence'...yada, yada, yada.

Fast forward about 3 weeks later, I receive another call from this company now wanting a payment of almost $1,500 to keep this loan out of default. Then this woman asks my why I was trying to make a payment of only $300 when that would not be acceptable. I told her that this other rep was willing to work with me, etc. She said they could not access my debit card, supposedly some mix up, and now I needed to pay them the larger amount. She transfered me to another rep, he was so freaking rude and just plain nasty. He bullied me into giving him my bank acct info threatening me that if I didn't, my loan would automatically go into default.

The more I thought about this, the more I did not feel comfortable about it. I called them and told them not to access my account, I was closing it. He then told me to just Western Union the amount I owed. I told him I did not want to deal with them anymore, I feel they are very dishonest. I realize that was probably a mistake, but ...

Any suggestions, any help is so appreciated.
Thanks, Cheryl