Hi there ​@Nichiren 

The service used is part of a Special service numbers for mobile phones. Check out the link for more details. 

Thank you Darius Koodo. 

I’m mystified.  I understand now that those numbers are a short form of telephoning a taxi, but the only explanation is that those numbers got stuck together randomly while my mobile telephone was in a pocket, because I seldom use taxis and I absolutely know what I was doing at the time these charges were added to my bill, which was not taking a cab. 

Can you tell me how to get these charges removed from my bill?  Thank you.

Have you checked your call log on your phone to see if you see these calls at the specified dates?

Maybe someone used your phone or like you said, it was pocket dialed?