why my visa card automaticaly pay when the rent of VPS expires even I had not topped up the MQL5 services?

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Hi everybody,
Previously, the VPS automatically re-registered because I had topped the MQL5 services with an amount of 15-30 USD.
This time, I had not topped up with any amount of money. But my visa card automatically paid without my permission to re-register the MQL5 service?
Why so, anyone can help me?
Is it right the MQL5 accessed into my visa account and took my money without permission?
Thanks
Hung