LESS OR NO AIRTIME AFTER RECHARGE, INCREASING EXTRA TIME BALANCE AND DISAPPEARING AIRTIME

I have been using the MTN Extra time service for quite some time now and lately I have been very disappointed and very saddened by the service I have been receiving from MTN. For a number of times I have been recharging my account and they would take their balance due, but the problem is that for too many times I have been trying to recharge using their extra time service, but I would either get NO airtime or up to R15.00 balance on my airtime, even though I recharge for more than R15.00. This morning I recharged twice, for R30.00 and I got R15.00, and I tried again for R20.00, and I received R5.00.

From the earlier recharge, I didn't call or send any sms or whatsoever, but my airtime was all of a sudden R10.00. With all the transactions I have done, I got LESS or NO airtime, but the extra time balance keeps on going up, and I have to recharge to pay back airtime never received.

I cannot keep on recharging my account for airtime I never received or used. Can someone at MTN please explain to me what is going on and where is my airtime going. I need this to be resolved and my airtime to be corrected. I also need them to provide me with a record of the amounts I loaded on my account and the amounts I used on the extra time account for the past 3 months so that I can verify the charges or transactions.

I have been trying to call their customer service numbers, but i cant even go through or get any assistance from their automated self-service options. I find this as an unacceptable business practice and bad customer service. We all work hard for our money and it is very disheartening that companies like MTN can easily take it just like that.