It is not possible to increase a VPS's individual monthly transfer data quota. If your server exceeds this monthly quota, you will be charged for "data overages" at the rate of $0.01 per GB.
If you have multiple servers, your account will have an aggregated service-wide limit (data pooling). This means the total monthly transfer data quota for all your servers is combined. Any excess usage beyond this aggregated limit will also be charged at $0.01 per GB.
For more information, please review the following helpdesk articles: Data Transfer ("Bandwidth") Pooling | BinaryLane
Is network speed throttled if my server exceeds its quota? | BinaryLane Is network data in both directions counted? | BinaryLane
If you require assistance, feel free to submit a support ticket at our helpdesk here: Submit a ticket | BinaryLane