paymentwall donation by mobile is a scam?

I tried to donate twice by mobile, sent SMS, got the code, but both codes were invalid. Money were obviously deducted from my phone account (sms fee). Paymentwall responses with generic anwers full of bullsh*t. They say they have sms from my phone number and code in system, still they demand some screenshots that money were REALLY deducted from my account (they have to be, when SMS fee is donation, u pay the moment u send it). They keep sending those preset answers to more ppl. Codes still dont work, my money is gone.
About 1.5year ago those sms generated codes worked fine. What happened? Why u keep suppporting service that scams ppl for real money?