Please try to buy another phone number or change an operator. Sometimes you need to make more attempts to receive SMS, it is a usual situation, because phone numbers cannot always receive SMS every time.

SMS receiving may depend on your IP address, that's why you need to use proxy or VPN of the country, for which you are trying to get the message. Also, you can switch to another browser or device.

Please keep in mind that if you don't receive SMS, the money will be returned to your account automatically.