Bad service at VW Soweto

On the 9th of September 2015 I took my car (VW Polo 1.6 comfort line 2007 model) in for 275KM service at VW Soweto ***<br> Key issues that I highlighted for attention.<br> 1. Misfiring - requested they check the HT lead cable or Spark plugs.<br> 2. The main electric window controller switch as all the passenger window switches are not working, only the driver's window is working fine.<br> 3. To clear the Air bag light - It normally comes back after jump starting the vehicle.<br> 4. To replace the rear left wheel ABS sensor and clear the fault.<br> Regarding misfiring