husband co-signed student loans and we are being taken to court

my daughter took out 2 student loans in the early 2000's, they were paid on for around 13 years, AES kept raising the interest which raised the monthly payments, so it was structured so that we could never pay it off, in 2019 we hired a firm called Aleevley in Calf, they were granted power of attorney and given over 5,600.00 dollars, they said that they are treating this as a predatory loan, they took care of it for awhile and then for some reason it was handed off to Optima Advocates and we were not informed of this until we started getting collection calls, in the beginning we could contact them now we cannot, AES transfered the loans to National Collegiate and now they hired a different law office one for each loan. the question is what legal stand do we have where can we go from here