Pronouncing My Surname

Most people I encounter in day-to-day life have a lot of trouble pronouncing my surname.

This is how my family has been pronouncing our surname for as long as I can remember:

[hɛlt͡s] -

However, according to German pronunciation rules, my surname should be pronounced like this:

[hølt͡s] -

For a guide to the IPA, please consult Wikipedia.