Vodacom - no one can fix the system error?

I am completely frustrated with Vodacom!!! My cellphone contract is ending this month - January 2025. Yet I am unable to upgrade my phone due to a system error that no one is able to correct. Took out at 36 month contract in January 2022 - my upgrade date is showing August 2026. I've been trying to sort the issue out for 2 years! Phoned & emailed numerous times, went into the vodacom store, to no avail. My billing is separate for each device with each having it's own line/number, but on the vodacom system it shows that I have 2devices linked on the same number? (not on my invoices) I get told the same story over and over. Vodacom employees agree it's not right, but NOT ONE PERSON is able to fix the problem & sort out my account! They basically tell what the issue is (after I have told them what the issue is) & just expect me to accept this. "That is what the system is showing".