Increased Debit Amount

During lockdown to be specific end of April I received a sms that my account will be debited with R1700.00 I was in shock . I couldn't call to inquire because we had lockdown. Same happened end of May. Under level 4 I was able to contact the telkom call centre . I was send from pillar to post I requested to talk to a manager. The agent took my details I was told the managers name is Lerato she will call me back. It's been almost 2 months that I'm awaiting for a manager to call me to explain to me why my debit order amount has increased so drastically. no call yet from management . About one years back I signed a contract with telkom for a router the contract amount was R269.00 per month . End of April and May this amount increased suddenly . A agent told me that my router was allowed to get data beyond what I signed for and when I asked how did this happened because I signed a contract for a set amount and a set amount of data every month. I'm still awaiting answers and I'm not happy because I have a budget and wasn't even aware of these changes by telkom.