It's not completely clear what the situation is, but from what I gather it seems that you're the sender and the recipient is not acknowledging a payment you have sent.
I assume that you have verified that the credited address
1Gouzjo9Jav1k4AmRoUJJMzidVfnMoSieS matches the one that you were supposed to pay to, and that the amount matches the invoiced amount.
1Gouzjo9Jav1k4AmRoUJJMzidVfnMoSieS has received 0.02661900 BTC in transaction b36157a7ca9630a88d98125fca91de81f488ef7d9a60f9e57af055d4d91f7a50. This transaction has been written to the blockchain more than a day ago and is confirmed. Given that this is the correct address, the receiver did get paid, whatever they may be claiming. Secondly, the money already got spent again which means that they must be fully aware the money arrived.
Assuming that you have paid the right address, the issue is on the receiver's end:
Either they gave you the wrong address which you paid correctly and someone else received the money (unlikely), they do not understand that they already got paid or incorrectly accounted for your payment (unlikely, since you already tried following up with them), or they're lying to you.
You should follow up with them and firmly assert that the requested address in question has been paid (after you have verified that it was the correct address) and ask them to check that their systems are working correctly. Perhaps that will prompt them to "suddenly find your payment".
Do not under any circumstances send them any more money, if they don't acknowledge that your payment has succeeded and deliver their side of your agreement. Often scammers will make up nonsense excuses to get you to pay even more money. If they do not acknowledge your payment, you may need to decide to write-off that money or sue them.