Vodacom Contract ****

I app**** for a contract device via Cellucity and got a call from Vodacom (V&A) to inform me that my affordability per month is R300 (maximum). I didn't qualify for the Huawei P40/Pro which I initially app**** for and was made a deal with the Vodacom store at V&A Waterfront that the Huawei P40 Lite was within my affordability. When I got to the store, I was pressured into taking an OPPO device because of Huawei's Google licensing agreement. The OPPO is also R300 per month for 36 months. Upon purchase, I immediately made the first payment which included SIM connection and pro rata costs. For the past two months I have been debited R488.90 while I expected to pay R300. I feel like this is a ****. When I contacted Vodacom I was told to refer to the written contract. It states R488.90 per month and now I look like the bad person, while I was ****med into this deal because this was not the initial verbal agreement. What was disclosed to me in the store doesn't correlate with what is written in the contract. I can't believe this.