Closing early on a Sunday

On Sunday the 26 of November 2017 I called cell c customer service to complain about my phone not being able to make or receive calls. They check the line and said everything is okay and that I should go into a branch and check my SIM card. The next afternoon I went to cell c Phoenix plaza about 15:25 as we all know that their trading hours is till 16:00. When I get there the sales assistant tells me that the shop is closed. I then ask for a manager he says that the manager is gone out. While talking to the sales assistant the manager arrives and tells me that they close their doors at 15:30 as not to allow any one in and close the shop 16:00. When I tell him that it is not lawful to do so he let's me in. He take me in takes my details give and gives me another SIM card. He then asks me for my identity book as he cannot use my drivers license and proof of residence. I inform that I do not have that on me. He then tells me to contact customer service and they will do the SIM swop over the phone for a cost of R50. I take the SIM card and leave the store. I contact customer service to have the SIM swop done only to discover that my line has now been blocked and no one can assistant me till it is cleared. How can we pay for a contract we cannot use and not helped with our problems. I can't wait till this contracts are up with cell c. Worst service provider.