Regarding input Credit of Vat

If Any item was taxable under category of 14.5% tax amd now it is become taxable under 28% category Then if we sell Stock on 1.07. 2017 from the stock which is accumulated before 30.6.17 thn what will be treatment of this difference of 13.5% in Taxation. Because a wholesaler gets the input @ 14.5% and now he Has to Pay 28% then he has to pay 13.5% Extra out of his profit Which brings hardship On that dealer.