@Sandra5053
If a host cancels the reservation, the guest will receive full refund.
If not, something must be gone wong in the (automated) process, so please contact Airbnb.
A host who cancels is penalised (charge a fine by airbnb, dates can not be rebooked)
Also the host will get an automatic review stating the reservation has been cancelled.
If you consider the host as a scammer, you have the option to report the host (via "report" option on the profile) to Airbnb.