I am always wary of phone numbers that start with 02 90.. or 91.. as they are almost always telemarketers or some sort of nuisance caller. This is one of those types of callers

Caller: Spam caller

They will keep calling numerous times without leaving message.

They ring all the time and when I answer it just disconnects so I'm guessing it's a scamming thing I just ignore the phone calls now

Called a number of times.
They did not leave a message so couldn't be important.
Pest

numerous silent calls

I answered and they said it was something about government incentives for people still working under the age of 60. I said no thank you and hung up so don't know how legitimate it is.

annoying time wasters

Scam

Calls and nothing happens. Cant call back as it won't go through.

Annoying... rings often and leaves no message.

I rang once and got disconnected