Mtn No Regard For Their Clients

Mtn really does not care for their loyal customers i have been with them for over 10yrs and had no issues until now. I had 2 contracts with them on *** and ***. My cell number *** was up for an upgrade in November 2020 which i missed the opportunity to do so. In December Mtn emailed me a deal and advised me i still qualify to upgrade online which i did after some struggle. Come end of December they tried to debit me normal rates over R1400 when i enquired as to why i was debited they advised me my upgrade was cancelled ( to date no one can tell me who or why this was done). I was told because my contract ended in November i had to be charged normal in December but a friend of mine was in the exact same situation and he upgraded in December after his contract ended in November and was not charged normal rates. Since then i have been shoved from billing to Retentions then complaints and no one seems to want to help. In the meantime my numbers have been suspended for these 4 months and im still been billed monthly and no one is advising me of this its over R6000. Mtn is refusing to disregard this amount and allow me to do my upgrade or to cancel these numbers if they cannot assist me with my request im really disgusted with the way they handling this situation.