I need answer in full details

Case study: You have been hired as a PERSONAL SELLING manager in Alfa Trade Co. that is SELLING MEDICAL EQUIPMENTS IN TORONTO AREA, For the first week of your job, you detected a financial drawback as managerial accountants notified you. Represented in THAT the ROI (Return on Investment) is declining gradually last 3 years as it was 20%by the year 2015 to 8% by the year 2020. THE REASON WAS THAT THE SELLING FORCE PRODUCTIVITY WAS DECLINING You held a meeting with the SELLERS and you HAD BEEN up to submit a change plan TO CORRECT THE DEVIATION THAT YOU FOUND PARTICULARLY IN THE PRE-APPROACH & THE PRESENTATION PHASE IN THEIR SELLING PROCESS DISCUSS IN DETAILS WHAT IS YOUR PLAN TO CHANGE AND CORRECT THE SITUATION , TOWARDS THE IDEAL PRE-APPROACH AND PRESENTATION PHASES