Hi. I have recently change my plan from first 38 to gold plus. Recently I check from online customer service celcom and it shows that I have;

Overdue Charges
-347.75
Total Amount Due
-299.25
Latest Amount Due
-299.25
Current Charges Incl Tax
48.50
Total Payment Made After Billing Date
103.90
Unbilled Amount
22.66

I have never seen this before. I pay my bills on time. Anyone can explain this?