Terrible Customer Service

I arranged the 5g for students. After I checked for coverage on the website it showed the area does have coverage I found out there is no coverage. Tried to phone numerous time with no answer and also send 2 email no reply. Got through on to cancel on 7th September got Ref *** was told I would be phoned back. Phoned 12 September got Ref *** and was promised I would be phoned in 2 - 24 hours. I told them I'm leaving for Scotland on the 14 September and need to arrange pick up of the device before then. Still nothing, worst customer service. Such a pity as the coverage at my home is working so well, but bad customer service will end the business.