10G depleted in less than 24hrs

I bought 20G LTE data on the 4th June 2021 and on the 5th June 2021 it was depleted. I called Telkom and lodged a complaint with Ref Nr: ***2, they have been been investigating since then with no response. I have a Telkom router with *** number and also had 20G that was loaded on the 23rd May 2021 and depleted, hence I had to buy another 20G using my *** mobile number but in less than 24hrs it was gone. I just called Telkom and checked progress of the query via their APP but its still pending. I had to buy another 5G on Saturday the 5th because it is for work purposes.