Here's the part where most individuals get the incorrect motion going. You're not attempting to shove something down the drain. What you desire to do is develop suction that will dislodge the blockage. Press down securely on the plunger until the cup is pressed against the drain. Now, BOUNCE the plunger strongly without pulling it off the drain. You'll hear water sloshing as the suction pulls on it. Bounce for a number of seconds - you'll feel the suction 'getting' at the plunger.
Make sure you get all the formalities right and don't pay the total up until the job has actually been completed. Remain in the loop and keep checking-in on the progress of the work. You have to be firm if y