Made a design for a client - never paid - what should I do?

@J.Thomas; First of all, i'm just going to jump straight into this topic and say a few things after reading every post.

1) Company or any other kind of entity, whether one of your employee's goes away, the parties who are working for you, and corresponding with you in a timely manner, should be told of one's absense. As you/your employee, failed to do so, on that behalf Umar had right to contact you/your company, to find out what was going on after not hearing anything from the corresponding employee.

2) It is both parties fault to not have a written contract agreement, but when a company deals with other entities, this question should arise all the time whatever the prospects.

3) The MM abbreviation, is latin and you are correct on that. However, when you declare that it is widely used in the financial industry, your wrong. It is not. "20 thousand thousands" is gramatically incorrect, therefore a single M which is the abbreviation for "Million" should be used correctly.

However, if you proove that I am wrong that the abbreviation of MM is used widely in the financial industry, which I very much doubt so due to the fact I worked in bank for 4 years, then I would apologise.

4) Finally, being this so called 'large company' would not disclose there financial findings, and to whatever profession you do, you would not get on a personal role with another entity (Umar) and call him "brother".

So as far as that goes, you/your company/your employee, are most to blaim.