It's pronounced "sa-la-mat" and is similar to the Tagalog word "salamat" which is also used for "thank you".
You can also use other phrases like:
* "Alab da ka" - This means "Thank you" in a more formal way.
* "Salamat saimo" - This means "Thank you to you".
* "Salamat kadato" - This means "Thank you very much".
Remember that Maguindanao is a spoken language and there can be variations in pronunciation and usage.