This is unfair and unacceptable and very poor customer service

My name is Lindiwe Mokhobo reference to my query is ********** 1870 in fianance department. I paid Cell C money by mistake over 8 weeks ago I was contacted by the finance department my query was handled by Lungile Ntuli after several weeks only on portion of R1030 has been paid and they insist that the other R580 due was paid into the account I have sent them my bank statements to proof I got no money I have been writting severl emails last communication was on the 17 September to date nothing has been said or done.I would appreciate refund of the money due to me please I have proof of all communication when this call was logged to date I