Sounds like you already figured it out - find another vendor.
Not sure the point of saving in eps or pdf. If you are providing print ready files you can simply export as a jpg file. Saving as eps or pdf sounds like there may be color correcting or something else going on. Corel does not do a great job importing/exporting files especially eps and pdf. Just seems easier to provide print ready flat file.
Not sure how much business you are sending their way but this is not rocket science -
Not sure the point of saving in eps or pdf. If you are providing print ready files you can simply export as a jpg file. Saving as eps or pdf sounds like there may be color correcting or something else going on. Corel does not do a great job importing/exporting files especially eps and pdf. Just seems easier to provide print ready flat file.
Not sure how much business you are sending their way but this is not rocket science -