Dear Hell Man,
I am so sorry, I don't keep a record of the times I am confused by non-standard RT, I am normally too busy! Although I do operate to and from your country weekly.
I do find the area air traffic controllers to be, normally, quite good, terminal area radar controllers to be fine, runway controllers to be mostly OK although a little slapdash when overworked.
However, there seems to be a marked reluctance by pilots, at all times, to even read back, verbatim, what they have heard. Never mind phrase requests and reports correctly. There is always that element of non-conformity. The simplest of all is substituting OH for zero. Air traffickers ALWAYS say zero, pilots rarely do, it makes little difference most of the time, but neatly illustrates a certain obstinacy. There is no need for it to be so, after all they hear zero from ATC so ignorance is no excuse, why refuse to use it?