The correct spelling of "wast a customer" is actually "lost a customer." The confusion may arise due to the similarity in pronunciation between the two words. "Lost" is pronounced /lɒst/ in IPA phonetic transcription, while "wast" does not accurately represent the pronunciation of the word. It is important to check and double-check spelling, as mistakes can lead to miscommunication and confusion. In business, lost customers can have a significant impact, so it is essential to use the correct terminology to avoid misunderstandings.