MTN are *****s when it comes to DATA!

I'm so disgusted with MTN, and that's not even the baddest descriptive sentence I can use, to describe how I'm feeling! I think I have been patient even enough seeing that I had this quiry since 17th of October 2weeks and 4refence numbers later, still not solved! I have 3gigs of recurring data that gets loaded every 17th of each month. On 16Oct i had 3gig data so on the 17th I expected to have 6gig when I check my balance seeing that I thought I haven't used September Recurring data. But to my surprise on the 17th I had 5gig so I called them asked them why?! What happened to the 1gig that disappeared. As I didnt get any notification that some of my data was going to expire, nor did it show on the MTN App. And according to the new Icasa regulations they the network is suppose to send notifications regards to data that is near depletion or near expire date WHICH I NEVER GOT! So MTN suggested that I get URL report. Which I never got proper explanation how this report will assist me! I just wanna know where did the 1gig go to OVERNITE! I'm so fed up calling them for follow ups with no solutions but I refused not to get something on paper or in writing! So show me where did my Data GO!