Vodacom SIM only cancelleation fee UNJUST!

I am immigrating and spoke to Lesego Keikabile on regarding two contracts I need to cancel, one being a SIM only deal of R200 pm. They want to change me R3 277.50 for data I am never going to use. My contract is due to expire end of Dec 2019 and as I read up, they are suppose to only be able to charge me 75% of the due amount but not even this was worked out correctly. WHY do I have to pay for data I will not be able to use? As Lesego said, nobody will help me get those amounts to a lesser amount. I do however not feel that these totals can be justified.