Unhappy customer

Hello Peter For the past 3months I have been enquiring about my Woolworth store card balance,reason being looking at it doesn't go down or finishing the settlement but nothing in-store they cant do anything about it.because of work constraints I can't go during the week,so I decided to communicate with them via e-mail. Woolworths Financial Services or Nationwide recoveries is the platform where I lodged all my concerns and disputes but they still can't or won't assist me in tracing where all the payments vanished to. My store card credit from Woolworth is R1300,since my last purchase in December 2021 I have been paying R200 from January until July, from August started paying R100 on September I payed via EFT and that payment they cant trace I have tried sending them proof of payment but still nothing now all I get is calls from their call center agents everyday,When I try explaing to them some of them they will put the phone on the side I'll talk alone or drop it on my ear."WORRYING" if that's the attitude or treatment we get from a well known business. Logically if I owe R1300 and pay for 10months already but still with the balance owing of R905 please help me and get to the bottom of it. Thank you in advance