Did you try it before buying? Can you return it for another one?
Maybe the skin is too thin, maybe the it has not been properly fitted, maybe the inside of shell is not properly done, there can be numerous causes to ringing problem, it is impossible to tell without seeing the drum and hearing its sound. I'm sorry, but there might not be easy solution to this.
Drum can be reskinned, bearing edge straightened, but all these things require intervention by a skilled artisan (or you need to research and learn drumbuilding yourself). So if you don't like the sound, exchange it for another one, if possible.