99% of political activity runs over phone lines. Not using phones would basically shut down the whole government and parliament, throwing a country back to the XIX century, it just can't be done.
What you can do is to change phones and to loudly complain with your counter-espionage and police arms that this stuff shouldn't happen. Except Erdogan has lost most of those constituencies already, which is why these leaks are happening in the first place.
I ask because, well, after weeks knowing that their conversations were being intercepted, it would be utterly stupid to still discuss sensitive matters on the phone.
If on the contrary, they're old recordings, this seems like a strategy by the spies to slowly release damning evidence. Nice.