أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Continue communication with her/him/institution by asking feedback and suggestion on personal basis. Once you won back her/his/institution's trust then slowly talk about business.
Honestly, I am not an expert as you mentioned, however I have the experiences to deal with this type customer.
What I have been practising is that I will fix an appointment and will go and meet the customer personally and will try to understand the situation.If the situation is worse,then I will try to feed his EGO.Whatever the customer is saying I will join hand in hand.Once all his frustrations are out then I will build a small repport with him and will make him understand that I will be there when there is any need.This helps us to win the customer back.
You have to see first, whey he /she has been get annoyed, address his/her concern first and try to resolve first as much as you can or explain him/her real situation as much as could be share with him or her. If you resolve or address his/her concern satisfactorily then you will earn him as loyal customer.
In very short "Your attitude determines your aptitude"
هل تحتاج لمساعدة في كتابة سيرة ذاتية تحتوي على الكلمات الدلالية التي يبحث عنها أصحاب العمل؟