Mr kammies

Awfull service for while now, I have noice that everyime I pay my account way before month end every month and then I see my credit available I have come to notice that every time my credit gets less or there is none like today I wanted to buy, nad I have the proof I had a certain amount and I bought less than that immediately it showed I used more my credit limit, see I had R176 I bought for R170 today and it showed I have - 180 I want to be explained what is going on or I Wil be forced to let legalwise take this matter further I have no magazines on my name no extra stuff to my knowledge and if I had 176 that is what there sould be and this is now every month it's either not there or it's less nlbut I pay my account on time and every month, and the other thing the purchase was voided today I recieved no sms back it was done the shop said I am gona lose that money so I want answers before I take legal action now