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OP mentioned this also happened outside in the parking lot and was implying active blocking.
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There’s ways for stores to work with telecoms to get service broadcast inside the warehouse/building as well to get around the natural passive blocking from the building materials.
I was well aware of the difference between active and passive blocking.
This is what charge backs are for FYI.
“I’m sorry, but you failed to provide a service. Either give me a full refund or I will start the charge back process with my credit card company and you’ll be forced to explain why your refund policy violates their ToS and any penalties that arise from that process.”