Some help needed

Some of the details I pulled with VIN
Car Model: W210 E 230 1997
Market: AG, Europe

I bought this car three weeks ago, I knew that there were issues on the vehicle but decided to take it anyway... A week ago I stopped to put in petrol and when I got back in the car it was like me key was not recognized and completely synced out... The EIS was worked on just before I bought the car and was still under warranty but after spending a sh!t load of money on less than a km tow and them refusing to come out was my decision to get someone else out to have a look and replaced the Ignition as well as key...

Problems:
The car starts sometimes for something like 1 second and then refuse to start unless you get out to lock and unlock the vehicle

The steering lock used to be locked but now it is unlocked - would the car start if that is a problem? We tried putting an emulator on but that couldn't fix it either.

The k90 overload relay module was full of what looked like damp or water damage but this was cleaned up, could this have a factor?

I really need help here as I am unsure of what else to do and every Tom, dick and harry want to charge me a fortune.. we did a diagnostics and cleared all the faults but somehow it still gave an IRZ/IZR comm error.