Vodacom keeps disappointing

To say I am upset at this point is an understatement. After waiting for 2 months for a delivery vodacom then gives me the wrong data allocation. When i did the upgrade on the 22nd of November, the price plan was 400gb at 10mbps and thereafter fair usage was going to apply and at 600gbthe data was going to locked. To my surprise this morning i find out only 200gb was allocated after waiting for 2 whole months for this router, i call the vodacom call center and no ones seems to know what i am talking about, but i am sure Vodacom records calls. I am frustrated at this point because i do not know what else to do. The last 3 months have been very disappointing as a Vodacom customer. Please allocate the correct data