他ほかを当あたる

expression, godan verb (-ru)

ask elsewhere; try another place

Used when the current store, service, or person cannot help, and you suggest or decide to go somewhere else. Often a polite refusal or practical advice.

• この店みせにはないので、他ほかを当あたってみます。

  Since this store doesn't have it, I'll try another place.

• 問とい合あわせの件けんは、他ほかを当あたってください。

  Regarding your inquiry, please ask elsewhere.