OVERCHARGING ME

In december my father account was suspended.when I foned I was told the account is in arrears with R167.00 then I arranged to settle arrears on the 15th of december,I paid R480.00 including january payment according to my knowledge.then on the 10 january the services were terminated when I equired I was told am in arrears with R404.00 which I still don't understand why as I settled arrears in december.so today the services have been suspended again and am told I have to pay R100 where am I going to get that money.am I now working to settle dstv arrears monthly?I always pay around the 20-24th and have never experienced problems.I am tired of phoning dstv as I always spend R40.00 airtime but never get the help I need.