Sorry, I didn't pay the property management fee and the property management company didn't decorate it. Is this legal?

It's not that the property management company won't let you decorate, but that all the owners entrust you not to decorate (including your own part). Because the property management company is hired and entrusted by all the owners to manage the whole community, (based on a legal contract), it is only the executor who prevents you from decorating. Failure to pay property fees is an infringement on the public interests of all owners. It is protected by contract law. Do you think it's legal?