Mtn bad service. False info

A few months ago my partner got a call from mtn to upgrade to a 4g day and 4g night data contract for a R129.00 a month she told them to call her back a hour later as she wanted to check with me if it will work as i use about 1g data per week. I then told her to go ahead and the contract was setup. Everything was f9 until i ran out before 10 days. My partner will then shout at me as she told me u need to use it for work only i rep**** i do. The other day i said to my self im not gonna use it because its to strange that 4g data only last 10 days. I took the data sim out of router and put in a phone to check and was shoked to see i only recieve 2g day and 2g night data. We where given false info on product.My partner calls mtn and get put on hold for more then 20min a time just for someone to drop the call. She have been contacted mtn more then 3 times in a row.The last person to speak to my partner requested a recording of the contract but we are being put on hold everytime just to get dropped again.