Yes, the original message is grammatically correct. It expresses deep gratitude to Ben for crediting the sender's Opay account, which they learned about from their sister. The use of "🥹" indicates a strong emotional response, likely conveying a feeling of overwhelming appreciation or happiness.
Here are a few rephrased options for your message:
1. "Ben!!! I can't thank you enough! 🥹 My sister just told me that you credited my Opay