Well if deleted on an account, you would need to then check with the company that the account was with and see if the files are retrievable or not.
If on an old phone, then it will depend on if you have the phone still. If you don't, then nothing you can do. And if the phone will turn on. If it will, then you may get lucky. If it won't, then there is nothing you can do.
If you have the phone, and it will turn on, then try the following...
There are a few apps/programs out there that 'may' be able to help you recover the data.
A few of the programs you could try would be... DiskDigger, MobiSaver, Android-Recovery and Tenorshare. They are all data recovery apps/programs. There are many others out there, so check around and see which...