Toyota — Fuel tampering during replacement of fuel pump

Address:

anand toyato service center ,shogi ,shimla

On 3 august 2020.. I visit shogi service center for replacement. When i entered service center my glanza vehicle fuel tank was full and after replacement i found 25% fuel was dimnished. When i ask to technician why is it so then he told me that fuel leakage happened during replacement.
What is this?? I thought it is professional to take work from toyota service center but i am very disappointed by the way they did work.
Even technician told me that it is your fault,,, you should not keep full tank while replacement of fuel pump. But before replacement of fuel pump nobody told me to keep half fuel tank. Either fuel tampering done or work done with unprofessional way which leads to not satisfactory experience.