If you are experiencing any problem with your Videotec's product, get in touch with the Technical Support team first of all.
Whether the item do need to be factory-inspected, you need to open a ticket to have a RMA number (Return Merchandise Authorization) assigned; inside the Ticket form, select RMA Number Request on the Type of Request field, and provide as many details as you have (product code, serial number, problem description, photos or screenshots, ...).
If you are requesting a RMA for more items (different products, or more than a piece of the same product), it is not necessary to request a RMA for every product.
You can return many items under a single RMA.
When you open the request, leave the Product Code and the Serial Number fields empty (they are not mandatory fields indeed), and insert such information inside the Description, specifying for every item its Serial Number and why you are returning the product for.
End-users can not return any product directly. An authorized dealer/distributor must be contacted, who will activate the return procedure and will be assigned the RMA with.
Note: do not send back any product without having asked for a RMA; it is going to be refused at arrival! You will waste your time and your money!