Bad service and *****

We have been Vox customers for around 5 years now, 2 months ago we moved and they came to install at our new address, they then sent me a mail saying i needed to return the router from the old house to them which I did. They now claim that I have sent them the incorrect router, when i ask for proof of what router they gave me they send me a doctored job card with a date on from before we even moved into our old house which is *****. They are now threatening to suspend my internet which i have paid for upfront unless I pay them R2000 for a router I never received which costs R1000 brand new. This is absolutely disgusting service. I will definitely be cancelling my account and will never recommend them to anyone. To blatantly commit ***** like this blows my mind.