Upgrade went wrong

I received a shock to my system when I recently received my Telkom December Invoice, totally unexpected. On the 17/11/2024 I walked in iStore at Tygervalley for an upgrade. Well and good one salesman offered to assist me, he asked the reason for my visit to which I answered that I was there for an upgrade. He asked as to which iPhone would I like to upgrade to and I mentioned iPhone 15 standard Service Provider is Telkom. He asked me the colour and I mentioned it to him. He was joined by a lady salesperson to process my upgrade. The lady checked my profile and mentioned that I was 2weeks ahead of upgrade, I asked her if I should come back end of the month, she rep**** no it’s not necessary. I asked if there was going to be extra charges like prorata, she said no. I asked how much is the cost of the cellphone set, she said it’s R1059, I was surprised cause I saw it was selling for R995 at Telkom I mentioned that to her she said Telkom and iStore have different pricing and taking an iPhone from iStore you have 2years warranty. They processed my upgrade on their Apple laptops and told me that I will be billed R1059 for the cellphone set on the 15/12/2024. To my amazement Telkom sent me an invoice for December charging me the Device obligation/Carryover fee for R1680.00 and Subscription fee of R880. I am honestly not financially prepared for this. I feel aggrieved as a customer that the sales person wasn’t transparent enough regarding the upgrade she was interested in making a sale at the expense of the customer not considering the financial implications this would have on the customer especially since she didn’t even bother to ask which package was I willing to go with, as I was on FlexOn2 I didn’t want to go on a higher/different package cause I don’t need extra data I have a data plan from Telkom and WiFi at home. Customer P/O PT_OA108094 Salesperson C05988 Operator CouAda5988 Branch TV:iStore Tygervalley