Received bill from LGH dated 9/16/18 for $106.03. ...

Received bill from LGH dated 9/16/18 for $106.03. Bank sent check on 9/10 but customer service said they only received it on 9/17/18 (Monday) but it was not posted until 9/20 (Thursday). Accounts receivable said I had a 0 balance. When I pointed out that they received a check for $247.79, she then said "oh yes, we're sending your a refund check for the difference. Poor internal procedures and poor communication. Glad I like the doctors!