Over paying

I am tired of this company,they always suck me dry every month,and I am tired of calling their call centre. Since I upgrade my account from compact to premium I face too many things,I started having premium account this year February and since I have been paying my account twice instead of me paying R989 including insurance I pay R1800 and they will tell me my account is overdue,so please I'm tired as my problem cannot be solved,each time I call I don't get any explanation why,so I thought it was better I report this,I'm so so tired