calling me with my own number....

How do they do that????? I do not pick up, of course

Here, this should help you understand:

https://800notes.com/forum/ta-a1703dda3611382 ... -when-they-call
https://800notes.com/forum/ta-a4b112e80bcd329 ... mber-to-call-me
https://800notes.com/forum/ta-db16ad0cc7fb949/my-own-number-calling
https://800notes.com/forum/ta-bc4219c7b51a3cf/spoofing-our-number
https://800notes.com/forum/ta-c0174dafdedbd70/using-your-own-name
https://800notes.com/forum/ta-dbc83925d363add ... -make-robocalls

Just so you know for the next time, you can input words and phrases in the search box to find these topics already made.

You can block your own number to end this. It won't cause any problems by doing it.

If scammers are calling me on my own number, why don't they get a busy signal?

Is that a theological question?

If you took the time to read, you would come to understand they are only spoofing your number, not actually calling from it. To actually call from your number, they would need to be right there were your phone is and yes, it would give a busy signal.