My contract nightmare with Vodacom

I had a contract of a WiFi router with Vodacom which I got in 2018 while I was in varsity. Early this year (2020) I was asked if I wanted to upgrade it and I said yes. I upgraded the to a Huawei Y9 2019, I did the upgrade at the Vodacom store near my place where I added insurance for the phone. I told the customer care guy that I wanted the phone for my sister and I was told to pay R300 upfront which I did. the phone on the booklet was R270 per month but my installed ended up being R640 which the guy didn't tell me and the insurance was R85. I went back to the store after two months to ask what was going and he said maybe it will stop and go back to the original installment with it didn't. 20 days I ago my sister was ****** on her way to campus and her phone with a laptop was taken. I went to claim for the phone and the claim was denied because it didn't have the sim card of the upgrade which in the WiFi router which was not taken. I really have had a bad experience with Vodacom after being a very good customer paying my contract and the device insurance.