Instagram Access

As a business owner, I am looking for someone with the necessary expertise to provide me with full access to an Instagram account. I do not need analytics at this time and need the access to be completed immediately. I look forward to working with someone who can provide this service for me.
I previuosly worked with an Agency - the email/phone number seem to be attached to them, whereas it should be my email/phone. I changed details in the App. but going round in circles. I just need to be able to post