MTN ALL NETWORK MINUTES *******

I have purchased an 214min all net 30day bundle from mtn on the 23 November 2019 10:36 am and i reset my call timers on my phone (Samsung galaxy note 8) as soon as the bundle was activated, today is the 9 December 2019 8:28 and my bundle is depleted, i crossed referenced it with my total out going call time and it shows i spoke for 167min. Where is the missing 47mins ? This was not the first time it happened!!! The response is that I keep getting is that i used up my minutes and how correct is my timer on my phone....This is the 3rd time my minutes are not adding up !!! Im just fed up of mtn ripping me off, the first time i reported this problem they gave me a trouble ticket number (Yello Customer!New trouble ticket added with ref SMC/***, Thankyou for using MTN.) I did not receive ant feed back from mtn with regards to that issue as yet, customer service seems very pathetic from one of Africas largest communications service providers