The debits and credits don’t equal at the end, meaning it’s wrong?

April 1: Sold merchandise for 3,000, granding customer terms of 2/10 EOM. Invoice dated April 1st. Cost of merchandise is 1,800.

April 4th: Customer in April 1st sale returned merchandise and recieved credit for 600. The merchandise, which cost 360 is returned to inventory.

April 11: Received payment for the amount due from April 1st sale less the return on April 4th.

At the end I get Debit = $8112 and Credit = $8208, which isn’t correct since they don’t equal eachother?

April 1st:

A/P DR 3,000.

Sales CR 3,000

Cost of goods sold DR 1,800

Merchandise Inventory CR 360

April 4th:

Sales return and allowance DR 600

A/R CR 600

Merchandise Inventory DR 360

Cost of goods sold CR 360

April 11th:

Cash DR 2352

Sales discount CR 48

A/R CR 2400