Highly frustrated with Telkom - less GBs than I signed up for!!

I am highly frustrated at Telkom! I signed up for the September 60GB deal. For December I noticed that they only loaded 50GB instead of the gigs I had signed a contract for. Last week I phoned the customer call centre and spoke to a consultant who said they would escalate the query to management. He also sent me a reference number but to date I have NOT received an explanation from Telkom Mobile about this. Very unprofessional behaviour - I will not be renewing any of my contracts with them if this is not addressed and sorted asap!