Telkom complaint

Im very disappointed in their service as I bought 4gb of data on 09 October 2019 @night and not even 12 hours later my data was depleted. On the 10th I called and spoke to a consultant by the name of Crystal who did not want to give me her full details she just said her supervisors name was Siyabonga in their cape town branch. They promised to call me the next day in the morning however they never did. I called again today, then they could not even explain properly what happened. I was even sent what they called "itemised billing" which did not even make sense, it did not even have timelines of how much or when I used the data the consulted(****we) even dropped the call on me. Then the funny thing is on the call they said i was online @8:30 but i was on the call with them at the time. This sim card is used on a router and I'm the only user that uses the router. Their consultants even gave me 2 different versions of my usage.