"Shall" is not used very much anymore, being almost completely replaced by "will" . Below are some "usage notes" from the dictionary: The original statement conforms better to the usage rules; "shall" being a statement of promise or determination that they will provide care. "Assure" is in the present tense which is correct.
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Rahul2689We assure you that all possible care will (WILL/SHALL) be taken from our end.It doesn't matter which you use. Most people would choose will, but shall means the same thing.