Avon is steeling from me

So I’ve been selling avon for as long as i can remember and it’s a total ripoff!!

They have handed me over to the itcba telling me that I owe them money but i have paid all my accounts and have send them proof of payment but no feedback now I’m fighting with itcba !! Its the second time that this is happening

The first time I’ve paid them R1000 and they told me that the money didn’t reflect of my account then i paid R1000 again

Now I’ve paid the R400 and they told me that I haven’t paid them yet although i have send proof of payment and now I owe them R800 that who knows where that comes from