Your payment may not be reflected because you have made your payment after your invoice period. Hence it will be reflected in your next bill statement. Paying before your bill invoice date will keep your bill up to date.
Will's bill cycle is on 16th (invoice date) of each month. On 16th Oct, Will made a payment of RM50 for invoice dated 16th Sept (invoice period: 16th Aug – 15th Sept).
Payment will be reflected on the invoice dated 16th Nov because the invoice dated 16th Oct was already generated before the payment was made.
For more information, refer to can I make partial or extra payment for my Digi bill article.