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What are my options for escalation?
Depends. Do you have access to ballistic missiles?
Bank transfer is the worst case, even debit cards mostly have chargeback schemes. You're probably stuck with giving them a specific period, typically 14 days, to pay up or face court action. Small claims are pretty easy to do and you don't even need to leave the house unless they foolishly insist on actually going to a hearing to argue the matter. I would caution that getting a judgement is only the start of the matter if they really do want to be dicks.
I ordered some kitchen appliances from a kitchen shop in October, for which I paid up front. 1 appliance arrived at the end of November. As of 2 weeks ago, despite me chasing numerous times I was told that it was not possible to be given a lead time for the outstanding items and that orders were "in a queue".
2 weeks ago I managed to track down stock of the outstanding items elsewhere and (with the agreement of the original shop) cancelled the remaining items. I still have not received a refund. I have chased numerous times and was apologetically told that the accounts dept would sort it today. They haven't.
I'm getting tired of writing grumpy emails. What are my options for escalation?