confused

I am a client who pays my acccount on time ,and I would love to know why my account gets to go on collection plan every time my last billed I checked was so suppossed to be R705.46 now all of a sudden I am in the rears of R927.46 please explain this is very bad service Mtn keeps on looking for money from you bad very very bad.<br> Please assist with this and please see below.<br> Marlon <br> ***<br> <br> Total value of Invoice between 2015-01-01 and 2015-03-03 R 1,325.44 <br> Invoices up to 2015-03-03 R 705.42 <br> Total cash received between 2015-01-01 and 2015-03-03 - R 1,645.44 <br> Invoices Paid since 2015-01-01 - R 700.00 <br> Balance as at 2015-03-03 - R 320.00 <br> <br> <br> <br> 1 | 2 Date Type Item No Second Ref Debit Credit Open Balance Status <br> 2015-02-27 CSH SCG*** W2P*** R 320.00 - R 320.00 - R 320.00 Open <br> 2015-02-27 CSH *** SCD925 R 705.42 - R 705.42 R 0.00 Open <br> 2015-02-13 INV E******0 R 358.04 R 358.04 R 705.42 Open <br> 2015-02-13 INV E******0 R 249.00 R 249.00 R 347.38 Open <br> 2015-01-30 CSH X*** ABSA918106 R 200.00 R 98.38 Closed <br> 2015-01-30 CSH *** SCD888 R 407.00 R 298.38 Closed <br> 2015-01-23 CSH