Sennheiser CX True Wireless Poor Call Quality and Constant Disconnection

I bought the Sennheiser CX True Wireless earbuds last week, but unfortunately, I'm having trouble using them for phone calls. I'm experiencing frequent disconnections, requiring me to reconnect each time. Regardless of my best attempts, there has been no progress. Furthermore, I have doubts about the delivered sound quality meeting the promised standards.

I tried contacting the company through email, but unfortunately, I didn't receive any response. For the price, you have the option to purchase ten mid-range earbuds that are capable of making calls. I can't comprehend why this product doesn't support such a fundamental function. I would like a refund for my issue.