Clueless store has no Sim cards

Vodashop Westwood has gone down dramatically. This is really disappointing as it used to be my go to shop. Their staff cannot access the system. They have no simcards for Sim swaps. One individual says you need an affidavit to blacklist the phone, the other individual says you need to blacklist the phone first then put the IT Ref number on the affidavit. My husband uses his phone for work and instead of coming in and doing a sim swap and getting back to work we are running from branch to branch as they are useless. There is no manager to assist at all. So disappointing.