Is it something to be concerned about

Recently I have received phone calls from people who I think are Chinese, as soon as I hear them speak I hang up and block the number, but would like to know if there is something else I can do and also wondering why I am suddenly getting these calls and if others are have experienced the same

Not 100% sure Spec but if it was me I'd just block. TBH I don't answer any numbers that are unknown.