Bad Customer service n not keeping on the agreement between the customer and Mrp Mobile

GOOD MORNING HELLO PETER Kindly assist me with this Mrp mobile they robbing me day light as i have took a contract of R159.00 per month and only to find out that they are adding more on my account of which i didn't agree on, now end of October i received a call from Somita that i owe R248.00 including arrears that i did not understand till today where they come from, and i tried to get an explanation but it doesn't make sense to me because i agreed for R159.00 Contract Monthly after the call i did pay the R248.00 amount n send the proof to them 3 days later i got a call from Somitta saying i owe 2 months in arrears again n today i got a call from Hlengiwe Mahle from MRP Mobile when i tell her i have a problem on this account why am i being billed for what i didn't agree on n they told me after the first complain i lodged with Hello Peter it was resolved on their side but she was so loud n Rude n talking non stop when i try to tell her why am i not getting assistance on this account ..... Hello Peter Please Help Me on this matter.