Going crazy!

Thursday afternoon my phone started ringing. It rang every 2-15 minutes until 6:30. I answered the first few to find telemarketers or robo callers. I was frustrated to be sure, especially since I've been on the "do not call" registry since 2003. I couldn't get a person for long enough to tell them to put me on their do not call list.
Friday morning the calls started just after 6:30 am. By 6:30 pm, I'd received 91 calls. I called my provider who, although sympathetic couldn't do anything I hadn't already done.
I was blocking the numbers as they came through. While at work I couldn't do it instantly and one number called 30 times in a 40 minute period. I was able to put my phone in "do not disturb" mode so only my contacts will ring through. Saturday, I had multiple calls but not as many. Sunday, I had about five calls and was hoping it was ending. But, no, I've had 32 call so far today.

I'm at my wit's end. The only thing left is to change my phone number and I really don't want to do that since I've had it for 20 years and I have job applications out there with it on them.

If anyone has other ideas I'd be grateful for suggestions!