Telkom

I have a 3 contract with Telkom. 1 sim cards for internet,2 phone, and 3 its a router. I got an SMS on the 14nth May 24 that they have internet connection. Since then, I'm struggling with my internet connection. I went to their branch, but they are guessing what could be wrong and they failing to fix the issue. I called their number several times but they not fixing the issue. I even wanted to cancel the contract, and they are saying I will have to pay cancelation fee even though they the one that are failing me as a client. I told them I work from home and this is affecting my work. I've never missed any payment and I've been loyal to them but they not delivering. eventually they told me that the Tower in the area I'm in has a fault, when I asked didnt they know this? why do i have to call as a client to complain? I didnt get an answer. My router was working fine before they sent their sms. Telkom allow me to cancel my contract because I'm not at fault, you are.