Vodacom charging

I signed up for fibre on 10th March, I was told it will take between 4 and 6 weeks. I decided to go for LTE as I was advised it will be for free for a month. The technician came to install fibre on the 23rd and the LTE was delivered on the same day. I immediately called Vodacom to let them know I won't be needing LTE anymore to avoid any charges. They advised that I don't have to worry about that as they will arrange for a pick of LTE box as soon as my fibre is up and running. My was was connected few days later. On 6th April I checked my account and to my surprise I was owing them close to R2000. I called and they told me it will be credited. I have been calling everyday since to check feedback with no luck, and today is 21st April and they have debited my account with that R2000. So frustrated about dealing with different consultant and having to explain my situation on every call.