Hello Bhim, you need to put 1500 in " Others " option while you make payment on VTU website. So your total amount would be total which includes 500 for Official transcript and 1500 in "Others " option.
If you personally go to Belgaum VTU office, it will be done in a single day and if you are doing it from other places then you need to courier the required documents to them along with the payment receipt of courier charges. As per the update, it looks like it would take upto 4 weeks for VTU to send your documents to WES from the date of you submitting the documents with VTU.
As per changed process, WES only accepts now the documents directly couriered from Universities. Luckily VTU does it and they send the courier through Indai Post - Speed Post services. Hope this helps.