Terrible TEMU

I've logged a TEMU return three times and each time I waited for their assigned courier company, Buffalo, to collect the items. Buffalo has still not collected and this after more than a month. I contacted Buffalo and gave them all 3 return order numbers. I'm still waiting. This is unacceptable service from both TEMU and Buffalo. How do I get my money back from TEMU if their courier refuses to collect? Shocking service!!