Annoyed Loyal Client

If i had a choice i would give Telkom a 0

I got a call on the 29th of to notify that my bill is on R6000+( i'm wondering why only now why not call when you can see he bill is way over my normal monthly payments) & when i checked on the App it is a sim that has been missing and I didn't find the need to report as it was on a permanent spent limit of R1 and was under the impression that even if someone uses it they would not be able to spent on it my question is how does a reasonable person that has been paying under R500 monthly over 2+years run a bill of over R6000?

I sent numerous of emails with no response to date except that i'm liable for the bill and this is a consultant by the name of Cele Nelisiwe . since the has been no assistance i will take further steps to report this to competition commission because I'm taking advantage of during a pandemic.