Imagine you are applying for a Visa credit card and asking for a credit limit of $15,000. While there is no set policy for reviewing and raising credit limits, the company's policy explicitly states that new customers may only receive a $7,500 limit, even when the family income is very high, as it is in your case.
Write a letter to Visa requesting a credit card with a $15,000 limit, and give detailed reasons (you make up reasonable reasons) as to why the policies and procedures of the company should be changed. The procedure should detail your reasons for an increase in the credit limit for new customers and why the current credit limit being offered is not enough.