Failure to abide by §§21.101 - 21.122 of this division (relating to Insurance Advertising) is prohibited. An omission of information, false implication, or impression which is misleading or deceptive or has the tendency or capacity to be misleading or deceptive is prohibited. The requirements of this division apply to either or both insurers and agents irrespective of whether acts or practices are performed directly or indirectly by the insurers or agents or in conjunction with or through non-insurers or non-agents.