Multiple calls with 048390 or 048391 or 048392 prefix. No message left. I do not answer the calls.

In the last two weeks I have been getting calls on my mobile phone from numbers with the prefix 04839, including 0483 909 643, 0483 912 517, 0483 924 746, 0483 925 936, 0483 928 784, 0483 928 985. Most of the numbers have the prefix 048392. I haven't had a call twice from the same number but sometimes there will be a call from a similar number immediately after the first call.

I am assuming that the calls are spam/scam calls. I don't answer them and they do not leave messages.