I understand why you do not want to contact them.
But if you havenīt called them once yet I donīt think they will mind too much. Because actually 4 month waiting is way above the average and after all, with the amount of applications they are handling, something could have gone wrong with your file, so at some point Iīd say you have to give them a call and ask politely...
I called them as well after waiting for 2 month (we had been told it would take 2 weeks at the assessment) and they did not mind at all and I did not get kicked out or something...