Yes, that's definitely a big risk to take especially if your target market is relatively small and you don't want to burn bridges. One solution could be to hav

Yes, that's definitely a big risk to take especially if your target market is relatively small and you don't want to burn bridges. One solution could be to have different types of callers (similar to freelance marketplaces) to chose from. You could pick a less experienced/expensive caller for stuff that isn't really important and pick a more qualified/expensive caller for stuff that really matters. Callers could even specialise in certain industries. Another solution could be to let users listen in on calls and provide live feedback to the caller but then most people would just opt to do the calls by themselves. Personally, I might still use such a service simply because I hate talking on the phone and am not good at sales.