Useless mobile plus

Mobile plus called me to upgrade my contacts up for renewal end October 20 Over 3 consecutive days I upgraded as they were quite pesistant.They advised it was the best thing to do as u don’t want to stand in those ques with COVID . I received the sms s stating they were all upgraded. In November I received an error outs bill almost 3 times more only to find out the after a day they cancelled the upgrade and I was then charged out of bundles rates .Since the 14 November I have been calling messaging to no avail Yesterday my line was suspended my alarm systems are all linked to my fone Business mails and call are all directed to these lines I have been holding on for literally 75 minutes daily only to be told the managers are gong to pass the credit but nothing is happening what or where do u go. !!.??