As someone that's worked in call centers for a fair time in my life, I'm not sure about this.
I've worked for a cable company for a while that really turned to shit, and went into buying off representatives rather than fixing their technical problems (heavily investing in making city owned fiber illegal in many states). Customers being enraged with us was a very strong motivation for me to leave and find better work with a less abusive company. And yes, call centers commonly shut down/move/ or actually start giving better service when they can't keep staff because they are such a crap company that their users are in constant rage mode.
I've worked for a cable company for a while that really turned to shit, and went into buying off representatives rather than fixing their technical problems (heavily investing in making city owned fiber illegal in many states). Customers being enraged with us was a very strong motivation for me to leave and find better work with a less abusive company. And yes, call centers commonly shut down/move/ or actually start giving better service when they can't keep staff because they are such a crap company that their users are in constant rage mode.