bad service

good day

my name is lindiwe nxumalo . on the 23/10/18 i received a letter from Lendiwe letebele floor manager , the letter stats that , the settlement amount of accout R8721.22 PAYBLE BEFORE 25/12/18. on the 22 of November i made payments of R1500. so i called vericred informing of the amount i paid and asked them to change my settlement Amount cause i made payments of R1500 . on the 7/12/18 i received a updated letter with the new Amount of R8019.03 . which i made payments on the 13 December 2018. now the telling me i owe R190, which i don't even know where does it come from . all i want is my paid up letter once the money reflect on their side , which is does . but now its problem, for vricred to send me that letter as they promised me .