Did not speak, hanging up as soon as answer button was pressed - Must be phishing for viable numbers ... hours later this repeats from different numbers.
A few days go by and the same procedure repeats.
Noting also similarity of first six numbers to my own number ... hmmmm
Poor performance from telco's security porotocols in issuing / registering customers to a phone number. Given the frequency shows it must be easy to fake or access a phone number / call line to make spam calls.