Hilti Customer Service vanished of the face off this earth with City Logistics

Booked in a repair with Hilti to collect a faulty Hilti 8 April, it has taken City Logistics weeks to collect the device after numerous follow ups. After threats of complaining about the poor service the collection eventually took place 25 April. Once the collection was done, there was no formal confirmation from Hilti that received the device after Collection Waybill was supp**** to Hilti. Once again various follow ups was sent to Hilti Customer service to get an update on the repair status and progress. However, Hilti Customer Service consultant seemed to have vanished off this face of this earth along with my device. 16 May to date, still no response from Hilti