New Delhi, Jul 28 (ANI): Senior Congress leader and former finance minister P. Chidambaram on Saturday criticised the Centre for failing to effectively implement the Goods and Service Tax (GST) in India in 2017. Taking to Twitter, Chidambaram said that the 28 per cent tax slab under the new tax regime has only added the Excise, VAT, and CST. "The 28% GST rate was the contribution of a lazy BJP government that simply added the Excise, VAT, and CST," the former finance minister wrote. Chidambaram also said that scores of small and medium-sized enterprises have been shattered because of the high interest rates under GST. The GST was rolled out in July last year after months of deliberation.