Feeling disgusted

I am extremely disgusted at the service I am getting, I have a cellphone insurance and have been paying R78 monthly, all of a sudden from June they started charging me R148 I am not sure why as nothing was communicated with me,I have been calling them and did not get any help, I sent emails and got no response .they are so useless all I want is for them to reverse all my monies and cancel this insurance, I cannot work with such unprofessional, useless people.