Best wifi service provider for Costitx

Hi there, we have internet with wifibaleares(Fibwi) - but not fibre because we don’t have access to landline in the finca  - the signal is mostly weak to poor and so we just purchased a new router from them and for a few days that was fine but now we are back to no connection- never assistance Saturday or Sunday - I work from home and obviously need a system that will not have connectivity issues - does anyone know of a good alternative? I am located down the hill past the cemetery- so in a bit of a dip - our antenna is on the roof with a clear view to the Binisalem Antenna - the fault is always between their Antenna and the www connection- I can’t risk my income being affected by bad internet speeds - any advice is much needed - thanks in advance - Angie