Airtyme not re-imbursed

I feel MTN has dealt me raw deal I buy airtime online on 6 March 2015 at 07:51 AM for R60 and it never was put in my phone and when i complained they claimed to have reimbursed me yet it never reached my phone neither did i received any notification of it being reimbursed they claim i downloaded on internet and they cannot explain what that was and i wanted to know how did i do that with no airtime and i could not communicate until 15:13 same day where i bought like R25 airtime online still. When one person called me to tell me the story about me dowloading from the internet on my phone the question was how do i do that when i dont have airtime. They did not reimburse my airtime. After I had been repeating my story from one call centre agent to the other, MTN really is not serving me right and i had been waiting for feedback on their investigation but nothing is forthcoming neither my airtime. I simply feel they dont care and i want full reimbur*****t of my R60 airtime. It is a lot to me