Telkom is over billing me, Because of Corona virus and lockdown related situations

I have a contract with telkom since last year paying 169 a month, paying around 90 for device & 80 for data. I've been paying very well until April 2020 and there was a brake out of covid-19 including the lock down and could not pay for May month, called telkom and explained my situation and requested that they bill me twice in June month. In June was billed once and for July they asked me for 540.70 which I disputed, it did not make sense and my number was suspended. I wanted to get a bank statement to see what was going on and it took a while because of lockdown. When I finally called telkom could not get help. Telkom used the Corona virus situation to bill me extra and that I must pay for the services that I am not getting from them. I want to continue paying for the services as per original agreement but right now I need telkom to bill me fear and That's the kind of help I'm looking for