Can you check your account again, my expire date was recently changed to Dec 31st, 2019. even though I had no flights for 2 years.
now i got this activity:
Starting XP counter1 April 2018
+0 Miles+0 XP
0 LEVEL MILES = 0 XP / 0 QUALIFYING FLIGHTS = 0 XP1 April 2018
+0 Miles+0 XP
140.000 Miles valid until 31 Dec 2019