Wrongly charged

Firstly I'm disappointed with how Mtn operate lately, i was upgrading my contract with mtn my upgrade is due since from the 31 October 2021. Now wen I'm supposed to get my new device mtn wants an upfront payment of R91128.00 how possible is that i must pay over so much just for a phone? Can someone please clarify this to me bcz i couldn't get my phone now because of this madness. My contract is only left with 3 months its ending in February 2022 so the balance remaining for is R2100.00 so where is this whole thing coming from?I called head office i couldn't get help and upgrade department as well they both refer me to revert back to the store because they are the ones who are doing my upgrade. Secondly i have a router contract that happens that i lost the password for it and the contract has ended already its now on month to month I'm struggling to get a technician to reset or retrieve the password for me since July i've been doing up and down to Centurion mall but the technician is always not available when i get there, this is really stressful especially that i've been with MTN since 2010 but they are failing me now. I tried calling yesterday to cancel this other contract no one answered, this morning i spoke to a Indian who promised to try and get someone to assist but the email he sent to me is blank, now I've been holding for more than an hour. I eagerly request help regarding the two queries that i already state above