Airtime disappearing

Ever since the month of December iv been experience bad service from this poor network cellc, at the same time both my airtime and data bundles would disappear all at once this is not the first time I called about these issues but it got really frustrating December. This morning the 05/01/2016 I bought 46 airtime and got 25mb free from cellc at the time I only had 4mb and the bought 100 daily mb, I went on the Internet as I usually do in the morning check my insta notifications and Facebook, my WhatsApp which I already bought separate bundles for. But then I was left with R1 airtime and 30mb..... I could understand how my mbs were reduced but where did my airtime go???? I have been using this poor service much to know that when you have bundles before your airtime is charged the bundles are charged 1st and they start with the daily bundles, I called the customer care they couldn't't answer where is my airtime. I am so sick of this stupid company. I have screen grabbed the smsz I get when you recharge in the past week the amount I have used recharging, they told me they will answer in 48 hrs which is an inconvenience to me as I was busy with an application on my laptop