Plum IVR Support

I have code such as <say-as type="acronym"><%=zipCode %></say-as> and <say-as type="number:telephone"><%=location.getLocationPhoneTTS()%></say-as> that does not work in Spanish. I am using AT&T Natural Voice TTS

I tried creating a string with commas between characters but it renders "uno comma dos comma..." Are there fixes or viable work arounds for this?

inserting spaces instead of commas has made for a better result.