Lost or Sold electric motor pump for s****

In March 2017 delivered a electrical pump motor to service centre and repairs. Cost to repair was eventually confirmed. Followed up after months to collect to be advised that pump was not with them. Provided copy of repair slip via email to confirm and collect. Was advised they cannot find it and was / could have been sold for s****! Requested now for 2 weeks as they said they will try and find it? No reply and requested replacement pump or new pump if they cannot provide motor back.

Repair slip shows / states nothing that if not collected or collection period (maximum of 2,3 or 6 months) or even at repair center that this is part of T&C, that pump can be sold as s****.

Please, I require your assistance to get motor back.