******* into taking an Additional data contract

A sales agent called me last week Monday notifying that there will price increase on my current data plan and because I have been loyal customer and account is up to date with MTN she is offering me a data plan where I will be paying R269 instead of the current R299 plan I am on. The plan she is offering me also has a LTE router. So I was not sure all of this I told her before I take I want to see the contract which I never got until this week when I had to call Mondo numerous times. The contract states that I got an additional contract, meaning I now have two data contracts with MTN. For past year I have been paying MTN R302. 02 for my data plan contract but as of this on the 21st (which is weird because I only get paid on the 25th that sales girl chose the date for me) I will be paying MTN R597.55. So when the sales girl called make an offer she made it as if I will be only R269 but she never said it is additional contract. What I like know is why would I need two data contracts. I have logged calls with to come and take their router and sim card but I was told go to a MTN store the people at stores say they are franchises and Mondo will have to send a driver to come fetch the router and sim, because I can't pay for two data contracts. Mondo will just have to cancell this additional contract.