They will promise you a promotion, even give you a date and tell you to tell your family, then on the day of your promotion will say "well, corporate will not approve leaving M&D yet as we need all hands to maintain our current contracts". Happened 3 times, 3 dropped promotions. Each time I asked when we would get more staff so that I could move on. First time: 3 months, Second time: a year, Third time: and least 2 years if things go smoothly.
Lower tier agents are treated as inferior human beings. People are downright derogatory, and while M&D experiences much less of it than floor agents they themselves often turn around in their own seats to fight each other. While this makes the work place toxic, the real culprit is management. Teams are understaffed, overworked, and have to maintain mountains of SLAs and documentation at the same time.