After gearbox installation, the engine no longer starts

Hello My V70 T5 P26 got an outdated new gearbox 14 days ago. After the installation probably the clutch pedal sensor was defective and the car only jumped briefly. The error reading resulted in the error with the sensor. It was replaced by the workshop, but the car still didn’t start. A new error reading resulted in a capped drive shaft sensor. It was also replaced and the car still doesn’t start. The workshop doesn’t know any more, the car was even at another workshop last week (allegedly a professional) and they don’t know any more. Another error reading did not result in any errors. And in today’s conversation I was told that they are now expanding the gearbox again because they suspect that the gear of the flywheel is bent and therefore it doesn’t start. On the other hand, they also said that it probably concerns, but not correctly (asks me not what that should mean) and it would listen as if the piston goes up and down, but at the next high then no spark produced. Long speech short sense, someone from the LG has asked me to save a funny thing, if the piston is still a bit of fun.