Is scheduling for a PRI supposed to take this long?

I'm not sure what's going on but I was told close to the beginning of the year my application was passed onto the interview team who should contact me to arrange. I still haven't heard anything over 15 weeks later, and its now been 25 weeks since I initially submitted my application (I was told a 20-22 week lead time was standard).

I feel that this is quite disappointing that no one has even proposed any availability or even reached out to apologise for the delay. I had quite a lot of respect for the IET initially, but I feel that the way this process is handled is not the best and doesn't instil confidence. Some of my colleagues have applied for CEng through the IMechE, and have put in applications after mine, been interviewed and received their confirmation all before I have even had an interview date. It's slightly upsetting as I committed my own money to the application when many things are not exactly affordable at the moment - it's not the easiest thing to forgo 200 quid at the moment. 

Is this normal with the IET or does it sound like there is an issue with my application or the processing?