If CamSurf took away paid features that you had access to, first make sure that your purchase still shows as "active" in the app store or on your account subscription page.
If it doesn't, go to the app's settings (on iOS or Android) and log in with the same account you used to pay. This should bring back in-app payments.
If that fails, collect proof (receipts, transaction IDs, email) and send a support ticket via Xolvie explaining your situation.
Related Complaints
Unable to Access Camsurf Android App Despite Paying for Monthly Subscription

I am a monthly subscriber of the Camsurf Android application, but for the past 3 days I have been unable to log in or access the service at all. During this period, I have already paid a total of ₺135, yet my subscription is unusable. My account does not have a customer or order number; when I log i...
Camsurf Charged Me Twice for Plus Membership Without My Consent

On August 16, I purchased a Camsurf Plus membership and paid ₺139 for it. However, just two days later, on August 18, I received a message from my Ziraat Bank account stating that another ₺139 had been charged by Camsurf without my consent or any action on my part. This unauthorized charge is unacce...