It looks like I was charged twice for the same/different plans, what do I do now?

Edited

If you accidentally purchased a plan twice, on the website and via the App Store, please contact the support team via the Contact Form with confirmation of your subscription purchased via the App Store (a screenshot will work perfectly). To see your active subscriptions, follow the instructions below:
1. Open the Settings app;

2. Tap your name (Apple ID settings);

3. Tap Subscriptions;

4. Look for a Muscle Booster subscription and please send us a screenshot.