This company will go to any lengths to collect a bill, whether the amount on the bill is legitimate or not. On several occasions, I have received two separate bills within a week showing amounts due differing by $100s of dollars. As the bills are not itemized, there is no way to determine if either is even correct. Furthermore, these bills say to call or write with questions promptly, but not to send correspondence to the address listed, only payments. A correspondence address is never listed...because they don't want you to correspond with them. It is much easier to deny the contents of a telephone conversation (or the fact that the conversation ever existed) than receipt of a certified letter.
I would encourage everyone to avoid doing business with any organization that uses ASF International as a third-party service provider. For example, I will never go to a Gold's Gym because I know that they use ASF as a third-party service provider. Determining this will take some additional due diligence prior to signing a contract, but it is well worth it if you ever have billing issues. Besides, hurting the bottom line of their customers (who will realize the issues when you refuse to sign a contract because they use ASF) is the only way to force them to change their billing practices.