However, about a month ago I started receiving these automated calls from a "private caller" which calls my number 10 times a day and then leaves voicemail messages, completely filling my mailbox on a daily basis.

I spoke with customer service and all they can do is change my number, which is what i wanna avoid. The Nokia Call Screening feature doesn't work with blocked numbers.

Is there any way to prevent this/any/all private callers from calling my phone. I'm open to anything.

Any input is appreciated.