Grimoire, it might be helpful to clarify what Keith agreed to. It appears your expectation is to be provided with a complete unpacking and installation service. This is quite different from "room of choice" delivery, which is a somewhat vague term that's often subject to service delivery limitations
As Keith doesn't directly offer either of those services, but relies on delivery service partners to fulfil them, his obligation to (whatever) the agreement is subject to the terms of the service partners, which may include longer delivery times, or service unavailability. It appears the latter is the case here since Keith hasn't found any couriers to offer the agreed delivery, in which case the right cause of action is to offer a refund, as he's now unable to meet the terms of the agreement.
Realistically, your options are to either accept the refund if you're particular about the kind of delivery, or maintain the order and accept that your required delivery preference can't be offered as a complimentary service/organised by Keith.
In any case, I think your expectation are not fully realistic. I don't think you're due any damages if Keith can't fulfil the specific delivery type because, again, it's expected that this is subject to actual availability of the service. Moreover, it was a complimentary service related to the delivery mode of the good, vs an actual paid service or condition related to the good itself or the performance of its function, so there's no direct loss on your path beyond the forgone purchase. Whatever additional preparation you had made (streamers, speakers stands etc) and costs incurred as a result, is unrelated to the agreement.
Overall, the likely expectations of the contract here (as it's unlikely you had an elaborate contract with sufficient terms to cover instances like this) is that Keith is obliged to deliver the goods according to the terms agreed, or provide a refund if unable to, up to/including the value of goods and services paid for, accounting for any promotional offers.