Call forwarding turns itself on

I recently switched from AT&T to T-Mobile and have had a few issues regarding call forwarding.
1. Call forwarding will become activated even if the settings don't reflect this. It will happen at all times, and will not ring beforehand, just goes straight to voicemail.
2. Always forward is turned off, Forward when busy is on, Forward when Unanswers is on, and Forward when unreachable is on. I cannot change these settings from my phone. ("Failed to read data. Unable to deactivate call...

Call forwarding turns itself on

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