I've extended a subscription but the number of days hasn't changed.

If you paid for a subscription, and after that in the application you see that the time remaining until the end of the current subscription has not changed, then this is normal. Once the current subscription ends, the next paid subscription will start immediately. If an active subscription ends while the application is running, you'll just need to restart it. You can find all purchased subscriptions in the dashboard. Please note that in case of paying by PokerStars transfer or via the PokerEnergy shop it may take some time (up to 24 hours) to activate a purchased subscription, because subscriptions are activated manually when using these payment methods.