Answer the questions, so it guides you towards the right team to help you.  Apply the drop downs and you will get a phone number specified to your question (ie - support, care): 

• I want to talk to someone. How do I phone you? - https://bit.ly/2SFUDdG

when I call up an existing tax return all the boxes in the income are blank until I click on an empty box then they appear.

It also shows and error in my entering from my T4A(OAS)j amount as it says I have put in an amount higher than the maximum allowed. 

My Turbotax form won't accept my postal code, which I have always had; how do I resolve this?

Delete everything in the postal code box, and retype it without any spaces. Ex: N2N2N2

There may be an extra space somewhere that’s causing the error.