Mtn customer service communication gap

I had a 50gb data and voice package from Mtn since the first black Friday and over the years they contacted me every time it was upgrade time and kept my package as it was. This year April we ran out of data on the 20th, May we ran out of data on the 14th. We received our data on 12th of each month. I went to Platinum Square branch in Rustenburg to enquire about it. First of all the guy at the counter wasn't eager to assist. I asked him to check my account. His reply....it is only a 1gb account and I need to call 135 for more info. Phoned 135 and they informed me that my contract ended and the promotional data was ended. No use trying to fight so I enquired about the uncapped home data package. The agent said I can upgrade to that but need to make a payment. I made a payment on the 16th of May. The router arrived on the 5th of June and till now I do not have data. It shows connected without data. I have been to the Mooirivier mall branch 3 times already asking for assistance. The agent send mails and escalate the problem and that is it. Can anybody please help. At this stage I feel like sending the router back for a refund.