Hi, Rafael 

Thanks for reaching out to us

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We never had an issue like this reported before, to be honest with you.

If i understand correctly, when  a customer tries to book an appointment from the front-end,

for them it says that that time slot is already booked by them;  and it looks as if  it does not complete the booking;

does not go to the Thank you Page;

but on your end, you can see the appointment actually gets booked in the back-end on the Appointment list, right?

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Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.

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Also, please point me to the page that has this service available for booking;

and tell me a bit more details :

 what is the customer name,

what date and time exactly they tried to book -

and what is the service name?

Hi, Rafael 

Sorry for the waiting time on the response.

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I apologise, but i did not understand your reply - I realise you deleted the plugin to reinstall it from scratch,

but when you say you tried to install it, and now it is progressing, i am not sure what you mean?

If you can please elaborate with a bit more details.  Thank you