Airtime & data

<p>Ive been using MTN for a long time now. Since i have been using them whenever i load airtime within seconds my airtime vanishes, now i have been calling MTN about this for a long time yet I get no answers... Today i bought me a Uncapped data bundle thinking its uncapped i will be able to use the internet all day, I used 150mb and i sincerely got a sms saying that my internet speed will be decreased to 128kbps. If i had known that i would never have bought an uncapped bundle because now when im on the internet its so slow and it keep buffering. I deactivated my bundle an now im using my fair usage data. Why tell people that its uncapped but the moment you hit a certain usage the speed decreases??? I buy so much airtime yet to be *****ed over each and every time... I think I should just change my network.</p>