He refused and insisted on price reduction.

I cant do 90days but they still insist for it.

If they insist on calling you, let it go to voicemail, listen when able, then respond by email so you train them on how you prefer to communicate.

I recommend replacement... and I always insist on getting a drip-pan WITH a drain line that runs to the exterior of the house.

They only get reset to year 1 of 30 if they insist on it (ultimately it's their call).

Students  always need housing and you can insist on their parents signing for it. 

Although I'm anxious to get this first deal done, I've had it under contract for 10 days but it feels like 10 months, I will insist on at least $1K.

That is how I got started, and now I own a portfolio of cash flowing single family properties in SoCal, which everyone insists is impossible sometimes even after I explain in detail how I did it.

My advise, you interview a colleague(s) with experience and track record and you insist on being mentored.

Insist on buying wholesale and run your own numbers!