I purchased a single line handwriting font but I haven't got the SVG file.

There are two reasons why you haven't go the SVG file. The first is that you've accidentally purchased ther wrong type of font. Our single line fonts all have 'SL' in the name. If you're font doesn't have that then purchase the single line font at https://www.quantumenterprises.co.uk/single-line-/-single-stroke-fonts.html and then ask us for a resend for the original. Note that you must purchase the same number font as the original version.