3 Returns Pending 6 Weeks Later and NO RESPONSE FROM BUFFALO LOGISTICS

I submitted a SHEIN return on the 3rd of June, 11 emails, 3 Whatsapp's and phoning the Buffalo Logistics Customer Care every day, twice a day for the last TWO WEEKS - Still nothing!! I keep getting told this matter has been escalated, and still nothing, the "manager" Mandy promised to return my call on 3 occasions and to date no feedback has been provided. I don't even know what to do anymore, I am sitting with clothing and shoes that are of no use to me as sizes are too small or too big, and I cannot even rely on the return service. I am now sitting with 3 pending returns. The level of service received from Buffalo Logistics has just been nothing short of shocking!!!!!