Ringing someone is rude? Strange.
Banging on your door is rude, phone calls aren't. Just don't answer.
I had a new housemate whose policy is to never answer the front door, unless it was arranged and he knew who was calling round. We've all adopted this policy in the house. His reasoning was if it isn't arranged and you aren't expecting them it can only be for something irrelevant, annoying or unwanted.
My intercom buzzer went at 09.20 today, it was my next door neighbour’s daughter, her 5 y.o. had woken up with a temperature, and a rash across her chest.
The mother called and got an emergency appointment with her G.P., and armed with spare keys, walked around to pick up her dad’s car to take the kid to the doctor.
On arrival, her dad’s car had a flat tyre, so she turned to me for help, naturally I galloped down to my wife's car, took the two of them, waited, took them to the pharmacy to get a prescription filled, then took them home.
It was rather fortunate that her dad didn’t live next door to you.