Army and Air Force Exchange Service Debt Collection Complaint

Army and Air Force Exchange Service Debt collection department,

Credit card Improper contact or sharing of info Talked to a third party about my debt Texas

I received a bill for collection with - amount, and when I made contact with the collection company the amount had changed to a totally different amount, $6700.00 to $8200.00, I 'm on - and want to pay this bill off and this company is taking advantage of my situation, I also received a letter from the social security stating that starting on - 2016, my - would be garnished at the rate of 15 % until the balance is paid and tax return would be garnished by said company, this company is out of control and I need a resolution, I called my credit card company and they no longer have my file and can not access it, the lady informed that I need to follow up with third party collection company and the lady stated she could not find any payments made to my account, and any payments made prior would not show on their side, so who is responsible, I realized I owe the balance but there is no reason for this company to take advantage