We are a Marriott weeks owner and I requested through Interval either of the Costa Del Sol Resorts (MMB or MUZ) for the last week in Sept 2018 or the first week in Oct 2018. I submitted my request about mid-January and there has been no availability. Any advise? It doesn't seem to be a prime travel period and travel demand is average for this time period. Do I need to give up and switch to a lessor resort?