I'm at my whit's end with them.
We sold our house months ago to some guy in the UAE who was going to rent it out. We made and had an offer accepted on the house we want. They made and had an offer accepted on a house where the sellers were emigrating. Nice, short and easy chain and everything was going swimmingly until 2 weeks before we were due to complete when Brexit happened and the UAE buyer decided that Britain was not where he wanted to invest anymore and he pulled out.
We put our house back on the market, our sellers agreed to wait, as did their sellers and we resold the house in 6 days!
But the new buyers are using Countrywide and now everything has round to a halt!
Our solicitors sent a letter out 17 days ago asking if they could confirm that they are acting for our buyers and there has been no reply at all 
Our estate agent has rung them. Our solicitor has rung them. Even I have tried ringing them but they refuse to talk to me because I'm not their client. Damn right. I will NEVER be a Countrywide client!
I'm actually at the point where I'm considering putting the house back on the market as starting from scratch as that might just be faster than waiting for Countrywide to do something!