If you are selling to a non-technical user, phone calls give them a hint of your support. Email support is horrible. Turn around times are too slow. This is the reason I wont buy another framework laptop.
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If L1 can solve things for you, a call sometimes can work, but really, if they can't, it meant multiple calls with L1 and multiple calls with L2 (in one recent example, it took 4 months for an issue to be resolved by internal support at BigCo where I was repeatedly asked for the same screenshot, including them recording me get to it a number of times, until I pinged their manager's manager via email pointing how they have the solution in there if they only read my emails, and got it resolved 2h later).