ZTE Router notworking

I recently bought a ZTE router (21 September 2020) from Takealot.com and it now has battery issues i.e. does not charge. I contacted the supplier as directed on my order i.e. Unboxza.com on 30 October 2020 who promised to pick up the router on the 2 November 2020. I have been following up via email and phone call with no luck. I have tried to get a contact no for Takealot to enquire how else can this be handled with no luck. Please assist.