MTN is misleading

So on Fri I recharge my phone n made a few calls then received \free airtime n data""; they all had the same excuse; call back in 2 hours the system hasn't updated. The same thing happened this morning so I called and spoke to Njabulo and this is what he had to say: if you have more than 3 applications running on your mobile phone they stop charging yo data and charge from the airtime . So I asked him then what is the point of having the data in the 1st place;n he said he doesn't have an answer."""