Disappearing airtime and data

On the evening of the 14th December 2015 just before midnight,I purchased data from mtn,a midnight express of 1G for R10,which lasts for 6 hrs.I was left with a balance of R17.00,l had about 30 updates to do.At midnight I started to update my apps,with in 5 minutes I couldnt access the network,I was out of data and even the balance I had had disappeared.I phoned the customer care,couldnt get through untill 00:51,I explained to consultant what had happen and I was told to reboot the phone which I did,I phoned again & I was told the system hadnt updated I must phoned after 4hrs.I phoned again at about 4am and I spoke to Mapaseka,who was very kind by the way and I axplained again, she could see on her system that there was something not right and told me I will be reimbursed with my data and airtime I lost.I phone again after 6am and I was given a reference number,I was told my query is handed for investigation I shud phone after 7 days.This not the first time this happens to me and I feel should make a noise this time around and I not happy,Im leaving mtn to another service provider if this matter is not resolved in 72hrs.