**Neither a teacher nor a native speaker.**
Currently I see two things:
You don't have to write "March’2010. From April’2010 to June’2010"
Just write "March 2010. From April 2010 to June 2010"
The ’ is needed when you write "’10" (without the 20).
Apart from quality we assure you to ship the cargo on time and your satisfaction is important to us.
The "and" sounds strange to me.
I would write:
Apart from quality we assure you to ship the cargo on time since/because your satisfaction is important to us.
(Either since or because, but not and)
Or maybe you can remove the whole part because it should be normal that their satisfaction is important to you, but it's your choice.
- For Teachers