Telkom Wrong Billing 3rd month!

I moved to a 40mb line September. The product is 1399 / month I got invoiced for R2667 in september I got invoiced for R 1667 in October new invoice for November 2018 = R2198

I only use the net, no phone calls, how is this possible????

Please fix asap. Please do reconciliation of MY WHOLE ACCOUNT. Here is my telkom reference. I really don't want to put more details on Facebook Insta and what ever i use telling the world how you operate. Keep your promise and issue the correct amounts on the invoices...!

Logged a call, and was told i will be credited today for the wrong totals i have been invoiced with.