Rain is unreliable and full of lies to costomer

Please I need assistance with rain account,I want to cancel my account but they refused,I was told I should pay R595 ,but I don't owe rain a cent,the speed they told me is not true,ICAN barely watch a movie,the connection is very poor, their sim cards don't even connect,there are days where I go by not connected at all.i am tired of calling them using my money and they don't even pick the calls.i can't pay that amount because I don't owe it,they told me as long as the rain 101 is on my premises ,they will deduct but they told me that it's a month to month bill last year,if I don't want to pay,then they should just stop.i am so angry, frustrated and I feel rain has wrong and used me. Please assist