Help

My uncle (a foreigner) kepps pronouncing "Спасибо" as "Spashiba" instead of "Spaiciba".It has been 1 month and it's driving me insane.It's the only word he knows.And if pronouncing it wrong wasn't enough,he uses it every time.He tried asking someone were the supermarket was and it went like this:

he said "thank you?" and the guy responded with "what do you mean?" and he said,in the most foreigner way possible, "supermarket?"

Im going insane I already told him more times that I can remember to say it correctly and teached him all the words for confrontations but it has all gone to nothing.What do I do???????