nikolina

I have a 2020 Audi A3. A malfunction occurred that no one can determine what it is and what caused it.
It was very cold, the fuel light came on and I didn't fill it up until it fell to only 10km of fuel left. The oil that was poured into it was half frozen and since then everything has been moving. The day after refueling, it started normally in the morning, the first reaction it gave was shutting down while driving. He started to idle on the back, his revs dropped below the minimum, he worked as if he wanted to shut down. I took it to diagnostics, it reported all errors related to fuel pressure and that 3 and 4 nozzles are faulty. We checked the nozzles, the nozzles are fine, we replaced the nozzle washers, the oil filter, I checked the fuel filters, the EGR valve, the camshaft, the engine rocker... everything was checked and everything is in the best order. Can someone give me advice, an expert opinion on what to do next? Thanks in advance!