客户永远只是客户，不要投入太多感情，都是建立在有利可图的基础上的
销售员要明白谁是自己的优质客户和目标客户
这位销售员即使多年后拿到了订单，但是是你的主营产品吗？是可持续性发展的业务吗？
还你人情罢了，或者只是一时需求，没必要浪费过多时间

 i had same experience but i provided him with my job reference and very funny that my customer asked one of my previous customer's contact information and contacted directly, customer is not Indian but from Israel.
Of cause finally i got the deal but frankly speaking i did not feel very happy because i thought same as you , what i did before was my privacy and i may not do same in future no matter how important the customer will be coz if he doesnt know how to respect supplier, nobody will respect him either