Old Directv Employee

I worked for Directv before the ATT merge in 2014, then quit, then came back and worked again. I now no longer work there, but when I was getting verification of employment for a new employer they only verified the portion that was ATT. how do I get work verification from 2014 for Directv before the merge? It would not allow me to look up my W2 from that far back and I no longer have a hard copy. I do remember my old ADP logon but the ATT log on is completely lost to me. I need to enter this proof by Wednesday (2days) to be hired for this new job. Is there a number the supervisor can call to verify the employment from back in 2014?