Telkom data disappearing

To whom it may concern For the last 2 months ( March & April) we have been experiencing that our data is disappearing. I am at getting no satisfaction from your call centre’s staff & find the service shocking. We ‘ve been asked to change our password & this has been done, But still the data is disappearing. We’ve unplugged our router at night & still the data is disappearing. As at this morning, we are only on 11G. The 1st of April we were credited our 20G Day & 20G Night. The next morning, 5G was gone. I called & was told that we were in a minus. That’s not true as in March, we bought 20G extra. I want this matter to be investigated & revert back A.S.A.P Please treat this as URGENT