problems copying account from another server

Any help or suggestions anyone can give would be greatly appreciated. I'm trying to move my WHM reseller account from one host to another. The old host is completely unhelpful and uncommunicative, so I have to find a way to do this without them. There is no SSH access either. Currently, I'm getting the below error (as reported by the new host) when they try to transfer the account.

Are there any suggestions on how to resolve this? Any alternatives? What about just copying the account as a CPanel account, then making that into a reseller / WHM account and moving the other sites under that one as sub-accounts (I read that somewhere here)? What will I lose if I try to transfer as a CPanel account? What about a backup / restore?

Thanks in advance,
Randy

-- ERROR --
Packing Account using suexec method
/tmp/cpmove-sermo exists, please remove it and try again
DOWNLOAD READY in /tmp/cpmove-sermo.tar.gz
Downloading Tarball
--00:00:12-- http://69.61.1.8/%7Esermo/cgi-bin/cpdownload/cpaneldownacct.cgi?sermo
=> `cpmove-sermo.tmp'
Connecting to 69.61.1.8:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/x-tar]
Removing Scripts using suexec method
UNLINKED
Checksum Failure [[d41d8cd98f00b204e9800998ecf8427e]] [[]]...trace information follows...
/tmp/cpmove-sermo exists, please remove it and try again
DOWNLOAD READY in /tmp/cpmove-sermo.tar.gz
Error while copying account...! Aborting Extraction.

 

Thanks for the info, I'm trying that now. Do you have any idea as to how that error occurs? The new host said it happened the first and second time they tried and the old host says those files don't exist. I can't check as I don't have SSH access.