dragging on the issue with two contracts

I had taken the unlimited contract and a tablet contract after them telling me I will have reception and that I can roam on vodacom. They have been dribbling me around for over a month . I am paying over R2000 per month for devices that do not work I have record of multiple emails aswell as screenshots I have no signal whether I roam on vodacom or not . I have purchased another sim as they advised I should do which they said would cost me 99 cents the lady at cell c store said I can only get the one for R50 the phone is now even more problematic I have been on the phone to over 13 people in customer care aswell as having spoken to Suzana and K Reddy the managers in the centre and have had this issue dragged out over 2 weeks with them I am receiving no solutions and have to constantly phone in for feedback the network keeps dropping and kicking Me out apps telling me im not registered on network I've fed up of trying to sort this problem out I just want to go back to my previous supplier and write this all off I can not keep doing and pursuing this it is taking far to much time and is absolutely disgusting this poor level of service