first - get hold of someone who has a MB DAS to run the transmission diagnostics through the multi port in the engine bay.. While at it the DAS can modulate the solenoids to free them up too. When done do a reset and get them to print out the workshop data sheet - it would show up what happened and what got tested, it will show you the tranny code, engine code etc.. helps in ordering parts
Shahnawaz Ltd are like ***** hustlers - they would say that you need to drop down a million rupees for their chai and pani -
How many kms do you have on your benz? this failure usually is a culprit of a deteriorated tranny filter and blocked lines or solenoid orifice