I mailed my Entex bill with my check enclosed on the 17th of april, they cashed it and it cleared my bank on the 21st of April . They say they didn't get it and wanted proof it cleared the bank . My bank sent them this information twice . Now they want a copy of the check, front and back . They cashed the check as a ACH debit and did not return the check to the bank so there is no way i can send a copy to them . On the back on each bill it state's that they will electronically debit the money and that the check will not be returned to the bank . I do not know what else to do to resolve this mater with them . The check was for $50.53. Sue.