Caller: alleged charity

Called multiple times per day for weeks. Hangs up if you do not speak within two seconds of answering. Does not leave messages. Claims to represent a cancer charity. Assuming it is probably a scam.

Repeated calls from 02 9127 48XX (e.g. 4826, 4824, 4822, 4841) over days and weeks. Never leave a message. If answered, no-one there initially (so autodialing from some type of call centre).

Calls daily. Hangs up after a few seconds without saying anything. Tried blocking it but it didn't work.

Called 4 - 5 times pet day and night. Claims to be a cancer charity, but when asked to repeat the name, get very evasive and shirty. I asked if had web site and they go angry and a abusive.
Now a clocked call. Scam be warned.