POOR services

On the 6th of March I have done a upgrade on my contract and all was fine, but then on the 13th of March for some reason the network migrated the new contract and because of that I have lost all my data, sms and minutes that I had left and still had to receive till the 23rd of June. Since I have reported it on the 13th of March the persons in the service centre keeps on tell me that they are busy working on it and will be in contact with me to let me know what is going on and when it will be resolved. Not once did I receive a ref. number from them and on Tuesday the 7th of April a gentleman told me and it will be resolved by today the 10th of April, when I phoned in today to find out what is happening with the issue at hand a lady told me that it might only be later on or in next week I have also spoken to there supervisor today and he said he will look into it and come back to me at 3 o clock which I doubt very much as not once since I have reported this has anyone come back to me to give me an update. As I see it my previous contract has not yet expire and for that I still need to receive my data, sms, and minutes up and till when the old contract expires