You're not alone! Google love to make an SEO's life difficult and have recently taken away access to accurate keyword search volumes for many of the tools users!
Fortunately I can offer you a solution!
I manage many adwords campaigns and as such I have retained access to the accurate monthly search volumes from the keyword planner.
Send me a list of up to 700 and I will return them to you complete with average monthly search volume AND 12 months seasonality (Year to Date or previous year, it's up to you)
Don't rely on 3rd party data and inaccurate workarounds, get accurate data to plan your campaigns success!
Standard keyword volumes
Accurate Googlekeyword search volumes for up to 700 keywords