Bad contract bad service!

Vodacom vodacom 3 months back on the 25th of February 2019 i app**** for a settlement qoute on my vodacom contract i got it and i paid the amount which was 4068.46 on the 26th February 2019 and a month later i get a call suddenly after they ignored my calls when i wanted to know about my cancellation,they decide to call me a month later on the 4th of April to tell me that i owe them R291 that i should pay that amount because my account is on arrears,i paid that amount but still my contract status is still open after paying for cancellation fee the so called outstanding balance and i now have bad credit report because of VODACOM!VODACOM i am really tired with this account of yours you ate my money i am enough now just clear my name been trying to apply for a car application i am rejected because of your stupid contract and errors please do something i am really tired now!Contract settlement payments and cancellation 1- ********** ********** and when you call me you are all lying to me"no you your contract is cancelled and we cleared your name"but my credit report says something else.