Delay for Parts Replacement - Disappointed

I had my inspiron n5010 diagnosed as motherboard complaint as it had 7 beep issues. Since the processor already replaced, tech soon spot it as such.

Processor replacement was kind a fast, with 2 to 3 days. Now its 3 weeks since the motherboard replacement is in place. Most days dell support calls me and informs the part is not available.

I need this urgent as my work is going to have an impact due to this.