This is a common speaking mistake.  When English words have a double c (cc), we sometimes pronounce the first c as hard, like a K, and the second c soft, like an S.  For example:

“Accept” is pronounced AKSEPT, not ASSEPT.
“Access” is pronounced AKSESS, not ASSESS.  That’s a different word with a different meaning, right?

However English is not consistent.  We do sometimes pronounce cc like a double k.  Example:
“Accolades” is pronounced AKKOLAYDZ
“Accomplishment” is pronounced AKKOMPLISHMENT

So it can be confusing at times.  Use a good dictionary which also shows you how to pronounce words (phonetics) if you are not sure.

We also have xc which sounds just like our first example of cc, which is to say the first letter is pronounce hard, the second soft.  Example:
“Except” is pronounced EKSEPT
“Excess” is pronounced EKSESS

English can be fun but frustrating to learn, so try to have a sense of humour about it and use a variety of resources to enhance your learning.