I have been working hard trying to make sales but unfortunately due to my head office taking their sweet time getting manufacturing quotes to me I have missed a lot of deadlines and the clients have not returned to me, making my job extremely difficult to do
The Pernod Ricard SA case comes to mind here. The employer must make a sincere effort to give you the necessary support to meet your sales targets.

Your employer is either doing it sincerely or they doing it unscrupulously. It’s clear that they aware of item 8. It’s possible that they merely are trying to create a faηade of procedural fairness. Fortunately, you are meticulous in keeping records. Continue to do so. Where there is a genuine lack of support and you questioned about performance targets in an email, mention the lack of support.

Dave is correct when he says that you should currently focus on meeting your sales targets.