You included an image of your advertisement. I believe the banking department was kind in saying it is in poor taste.
Your advertisement is not merely risqué, which can be indelicate, insensitive, and even provocative, but also gross, indecent, salacious, and ribald. Your advertisement falls into the latter description. You should be grateful that the banking department only called and didn’t write you up.
Maybe you need to revisit your advertising manual. Your manual should require that all advertising be true, honest, in good taste, and not misleading. Note the emphasis on “good taste.”
Although you are the marketing manager, each staff member who plays a part in preparing advertising has the responsibility to see that all advertising conforms to your advertising policies and other standards.