the internal box has been removed at some time so there is no isolator which you need - the new cable has one built in so get one of these -
https://www.diy.com/departments/tristar-data-cable-coupler/571706_BQ.prd
and all will be as it should be
if you want a neater job after that then you need a tech - best to book it now as they may want to charge you £99 in the future - if you call it in say its not working - turn the hub off so thats [sort of] true or they may not book a tech
or wait for VM who may book a tech - that may be delayed until lockdown is over though
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Tony