A, T, and T misinformation given, not receiving credit in a timely manner Atlanta, Georgia

I have DSL with A, T, and T and was having problems with it for several hours.  I was not able to connect to the internet.  I called about it and was told my modem was defective.  I was told it was covered under a warranty since I had it for under a year and that a new one would be sent to me.  When my next bill came, I was charged for the modem $75, the shipping for it $14.95, and taxes $5.40 for a total of $95.35.  I called about it and was told that there wasn't a warranty and that the charges for were correct.  I was MISINFORMED regarding this.  I was told that I would not be charged for the new modem.  I was then told I could send the modem back and I would be credited back the amount I was charged.  I sent the modem back which was never used because there was nothing wrong with my original modem to begin with. This was the SECOND time I was MISINFORMED.  The modem wasn't defective. It wasn't working because of a network outage which lasted for 4 days.  It has been 13 days since my modem was received by A, T, and T (per tracking information) and I still have not been refunded for it.  That was the THIRD time I was MISINFORMED.  I was told it would be refunded once the modem was received.  I called today regarding this and was told there was nothing showing on my acct regarding this. I was transferred to another Dept and got a busy signal when I was transferred.