added my airtime on my old sim, my data dont last.

I requested for a gold s6 but I got a black s6 I was fine whit that my airtime was transferred on to my old sim card I called the call centre three times last night. <br> <br> my sim card is still not activated for my phone (s6) I got an sms stating that my card is activated on my old pre-paid number I had 50mb on my sim card what happened to it? when ever I load airtime and buy data my data is gone in seconds may cellc please rectify the problem on my sim card please I cannot afford to have an open line contract because my data goes gone without going on to the internet that means I will have to pay cellc a lot of money for something I didn't use may you kindly remove everything on my sim card and can I please use my new sim card in my phone (s6) please because I switched of my old phone because of my data that's going missing n I am not using it! please call me on *** to assist with this matter my first contract with cellc and things don't look to good if the above cannot be done please come and collect your phone! thank you.