I'm guessing your in Socal. You were allowed to PVD during the middle of the year because the union had a agreement with the company to allow PVDs but ONLY inside employees.
When Oct 1st hit the company no longer needed the agreement because the contract allows them to hire ft outside seasonals so they canceled it.
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The reason you're not working as a PVD is solely because UPS doesn't want you to. They don't want to manager insiders with PVD hours. Also they don't want a PVD that has contractual rights. The company wants to be able to work a PVD 14 hours if need be. As a preloader you'll soon be doing 6-8 hours in the morning and they know you'll be tempted to call out for preload because you make more as a PVD and you will also not be able to work as many hours as a seasonal can.
The only thing you are entitled to is driver helper.
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But because of covid 19 and CA. Helpers are only being worked if the Driver says so and the driver gets to pick his helper because of CDC guidelines.