If, having discussed the issue on the phone you then went down to the front desk, you could have elected to take your trash with you and dump the bin/sack on the front desk loudly declaiming to any assembled onlookers while you did so the inconvenience etc. of not getting the housekeeping service you had specifically elected to receive.

(may be something for the last day of stay though, in case they get shirty and boot you from the property for calling them out)