OK so the train you were on, 1406 from Minffordd went to Machynlleth, then continued to Shrewsbury arriving at 1717. Then you caught the delayed 1747 from Shrewsbury to Leominster arriving 17 minutes late. Perhaps the TfW system is confused by the change of train identifier from the 2I22 to the 1I22 at Machynlleth. Or maybe it is confused because the 1I22 was terminated short at Shrewsbury, when it should have gone to Birmingham International. If you can't get the TfW DR automated system to work, probably email customer services. Whatever happens, you are entitled to the DR for over 15 minutes based on the cost of the ticket(s) from Minffordd to Leominster.