Hit a power line while drilling. What to do?

Hello everyone,

I wanted to install child safety gates in our house (built in 2018) and drilled OUTSIDE the installation zone, hitting an electrical cable at tile baseboard height.
At first, the RCD tripped, and since I wasn't quite sure about the cause, I reset it. Lo and behold, all the fuses stayed on, so I continued drilling.
On the last millimeter of the said drilling hole, the basement fuse tripped (I was drilling on the ground floor). So I reset the basement fuse and held a voltage tester into the hole, moving it back and forth... No voltage detectable with the voltage tester.

Now my question to you is: What can I do now? And what would be the pragmatic way? Just put in a bit of silicone and a plug? Or how should I proceed?

Thank you very much, best regards

Normally, you have to chip away the wall a bit at that spot.
You have at least damaged the insulation of one conductor, possibly also reduced the conductor cross-section.
Cut out the damaged section and reconnect it. Sometimes it might be enough to just re-insulate.
Or you go to the guy who messed up the cable there and let him fix it.
Simply filling it in is not safe, it could theoretically lead to a cable fire.

P.S. under NO CIRCUMSTANCES screw the stair gate in there now.
Those things are made of metal, that would be absolutely fatal.

Even a plastic grid still has the screws made of metal, which can be live.

Chisel open the wall around the cable, repair the cable, re-plaster and paint the wall again. If you are unsure, call an electrician.

UNDER NO CIRCUMSTANCES leave the matter "as is"!

What can I do now?

First, check if you even have a power supply. How many watts does your drill have? Has it always worked without problems so far? Was it heavily stressed while drilling?

First check whether you have actually hit a power line.

This is a systematic approach. Always separate fact from assumption. The RCD has tripped is an observation. Fact. Hitting a cable is a (plausible) assumption. Check it. Conclusions about the skill of the craftsman, which are already being made here, are completely unhelpful at this point. What does a cable detector say at the mentioned spot where there shouldn’t actually be a cable?