Missing Airtime

I bought two airtime vouchers months ago and still have not received it. I tried resending the voucher multiple times with no luck. I have phoned customer service about 30 times and every time i just get the same run around. The agents put you on hold forever and sometimes just hang up. They tell you the voucher number will be sent the same day but it never does. The quiry gets escalated but nothing happens. This one or that one will phone you back but they never do. This is ridiculous. All i want is my airtime! I will never inconvenience you again!