no worries Omar.. the process has become very long these days. sorry it has been a while since i applied for my 300 visa but we waited and waited (submitted by paper in china) then one day our case officer sent us a email.
the email was not direct but in it the case officer refered us to the list of papers we needed to send to get the 300 visa. i went a bit crazy as i am very particular on paperwork.. i could not see the papers i missed when we applied.
then i realised what the case officer was looking for.. we had waited 6 months and at that time this was the standard processing time. so i had to think the case officer wanted something now that was not relevant when we applied.
it was the "updated relationship letter" see immi need to know you are in a "continuing relationship".. 3 days after sending this letter we got our visa.
i dont know if you applied online or not but after say 6 months of waiting i would do this letter.. just to update the original relationship letter when you applied... dont make it a sad long letter just an "update" to any new life things that are happening. we even put in basics like painting a room or preparing the garden for chinese vegetables.. arranging financial things or investigating future study/school.. keep it simple with a couple of pictures.
all the best.