Ok.....did they actually "say" they were going to garnish your husbands wage or was it the "wage garnishment unit" trying to get in touch with you?
No they cannot garnish your husbands wages. Period.
No it is not illegal to call his workplace. The only way it would be illegal is if he told them not to contact him at his work phone.
On the repayment. What he is setting you up for is called rehabilitation. The qualfiying payment for a rehab is 1% of your balance. (How much do you owe??)
No downpayment is required by the Higher Eduation Act to qualify for rehab...they can ask for it but they cannot make it condition of rehab.
Once you have made the 9 payments, you do not automatically qualify for ICR payments. ICR is the payment plan that is granted if you consolidate your loan with the US department of education.