Bad Servoce

on the 2nd of June I have send a move out reading to Eskom and requested them to cancel our account and pay back our deposit. In two weeks time I followed up just to find out that they did not do anything about the email. I have resend them the proof of the last email and requested our deposit back. They gave me a ref number *** and told me to email them a proof of Bank details with the bank stamp. I have done this and email them again on the 22nd of July and it still was not sorted. they told me that they will get back to me. I have followed up again today the 2nd Sep and still they promise me they will sort it out. If we miss one month for paying our Eskom accounts they will for sure cut our electricity but we can wait for months before they pay our deposits back. I say this is bad bad service