you have to stop the importation of substandard product from reach the shores of Nigeria. This product should not even left the port. They should be destroyed right there, the importer fined heavily and maybe even banned from importing any item. To deal with substandard product, you have to use a three point attack. stop the importation( supply & financier). stop the sale( retailer, distributor, warehousing) and then stop the usage( consumers).