Bad customer services

Hi my name is smangele mabuza,I'm jet account holder I have a problem with jet,on the 2nd of September 2021 I've payed my account at Qwagga jet store they called me asking me when I'm going to make a payment I told them I've already payed they decided to put me on arrears, I contacted them they told me they located my payment but still my account on arrears.Again I've made a payment on the 30 December 2021 I was using my fnb card to pay I didn't receive any receipt they told the system shutdown they say I'm must bring bank statement I did but now I receive the message that I must come pay 1800 please help me.