Disgusted about the customer service from Telkom

I'm extremely shuttered and disappointed at Telkom. My bill has been extremely high for the last 2 months. They have said that there are subscriptions on my data number which is a router sim card, which I know nothing about.

I have called them many times and they are failing to resolve the issue. They said this has been escalated as it is an issue that Telkom is currently experiencing but I have had no update