Once again pathetic service

One again disappointed with Cell C's pathetic service! So far I have had 2 disappointing encounters with Cell C. It looks like the customer has to do the work here. My husband opened up a contract with Cell C last year for a mifi pocket router, which is R200 for 20G of data(which is 10G daytime data and 10G night data) , we have been using it happily for months had a few hiccups but it was sorted. Recently we discovered that for 2 months they have been deducting more than the R200 which we usually pay every month they now deduct double - R399 for the same amount of data 20G without even informing us! So we go into the store to find out what's happening and the consultant tells us that the data is not capped! So who's fault is that?? We expect 20G of data and that's what we use! Usually before the data is up i will tell my husband so that we don't use it up and it usually carries on to the next month so we never use all data up! And sometimes at the end of the month the if there is no data left the mifi router will have a red light to indicate that there is no internet connection which means there is no data left, also we received messages on the app to inform us of how much data is left which has never showed us a low amount of data and still the price has increased magically. So my issue is this : 1. How can they deduct more money from us over the limit that we were told would be deducted! 2.The consultant told us we can also cap the data ourselves???? Why must we do their job! And we werent even made aware of it! We don't go over the 20G because we check the data and there red light indicates if we can't use it. Not 1 person ever informed us that our data is not capped, or it can be capped or it can be capped by us. 3. We never go over our limit how can we all of a sudden pay double!!!!

Cell C this is really pathetic service man, tell me please must the customer really do the work here, we are even paying for something we don't use!!! After all this, this is the last contract that myself and my husband will be taking out with Cell C and I will definitely not recommend Cell C to anyone. Too afraid that I will get less than what I expect to get such as simple and upfront service.