They do not know what they are doing

I was sold a LTE advance router it worked fine up and till a month ago. I phoned more than 100 times, the one consultant advise me to cancel the contract as they do not have the coverage in Delmas anymore. When I ask about the cancelation fee they advise me that I must pay R2500.00 to cancel. After I refuse to pay it they told me that I can migrate to a new contract. That was on the 9th of May 2019 then I phoned ton the 17th they told me the case was closed but not resolved and a new case was opened. Now when I phoned again today 21/05/2019 they still do not have an answer. POOR POOR POOR Service