Below are the formal and polite equivalents (synonyms) of 'help' which you can use in your business or professional pieces of writing.
Two of these synonyms are normally only used when help has the meaning of 'helping' people. There is one of them which is also used with the meaning that something will make a thing easier to do.
In addition to using this as a verb, you can use the noun of it 'assistance' with the same meaning.
'We were assisted in the creation of the report by the marketing department.'
'If you require any further assistance, please don't hesitate to ask.'
Although it has exactly the same meaning as 'assist', it is less commonly used in business writing.
'We will aid you in anything that you need.'
This is the one synonym which is used with the meaning that something will make a thing easier to do.
'This information will aid you in the creation of the report.'
Only normally used when offering somebody 'help'. You can also add 'any' to this phrase (e.g. 'be of any service')
'If we can be of any service, please don't hesitate to ask.'