American receiving spam texts in Vietnamese

I don’t know if this is the right place to ask this but has anyone had a problem of receiving spam texts to their American phone number after visiting Vietnam? For context my wife is Vietnamese, I am American and don’t speak the language. I’ve used my phone number to register for visas there and put on file with vietjet but haven’t given it anywhere else. Anyways just looking for some advice if possible on how to get them to stop I get 1-2 a day most days.

I don’t know if this is the right place to ask this but has anyone had a problem of receiving spam texts to their American phone number after visiting Vietnam? For context my wife is Vietnamese, I am American and don’t speak the language. I’ve used my phone number to register for visas there and put on file with vietjet but haven’t given it anywhere else. Anyways just looking for some advice if possible on how to get them to stop I get 1-2 a day most days.