I don't want to defend the hosting company but just a little perspective, their job is to provide you a working host they are not responsible for maintaining your scripts.
It looks like your script can not work on their configuration, first thing that comes to mind php version, your script may be done for older/newer version or use functions that are restricted in their environment for security reasons, check what version are they using and what version is your script made to use.
Keep in mind that while hosts help with small issues of the sort it's not their job to make your scripts compatible, it's your programmer's job
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