Incorrect Billing on Account

Wow, where do I start. I'll start from the beginning. It all started back in September 2017 when my one Telephone Account Number was due for an upgrade. I did the upgrade via online ordering and all seemed fine until the end of the month when I was advised that they upgraded the incorrect Telephone Number on my account (I have three telephone numbers), the one upgraded was not even due for an upgrade but they upgraded it nevertheless.

Long story short, we eventually had to go into Vodaworld to have it sorted out, which they could not do by the way, I had to keep the incorrectly upgraded account upgraded, and then upgrade the initial number again.

All was well and dandy until I started reviewing the bills that I received.... Since October 2017 I have been double billed for the handset, it is now heading towards Feb and I am still being double billed for a single handset. To make matters that more interesting my latest statement says I owe 13K on a Balance of Contract for Equipment. So not too sure what is going on there.

I've phoned multiple times with no luck, I've gone in-store multiple times with no luck and now I have to revert to Hellopeter to hope that my query can get resolved before I get handed over for a 13K bill that I refuse to pay.

Please can I implore you to review my account correctly and fix whatever the problem may be on my account.