undercharged
un-der-charged
adjective
Having been charged an insufficient amount for goods or services.
"The customer was undercharged for their coffee."
verb
To have charged someone less than the correct or expected price.
"I accidentally undercharged the client."
Thesaurus
Synonyms: undercharge
Antonyms: fleece, gazump, hook, overcharge, pluck, plume, rob, soak, surcharge