We completed the job 6/27. I forgot to send in th...

We completed the job 6/27. I forgot to send in the completed invoice - my fault. Other maintenance companies have contacted me to say they hadn't received our invoice, but not this company. So I did send in the invoice and Ferrandino shorted us 11.82 on a 278.00 invoice - 4.25%! What is that? We would never agree to doing work for a company that TAKES a 4.25% discount. BTW, the work was done over 90 days earlier.