Dreadful Customer Service from AFROX GAS

We have experienced DREADFUL customer service from Afrox to uplift and credit a faulty helium cylinder from our party store. This has been ongoing since October 2018. After numerous emails and phonecalls to the PE branch (listening to "call centre voice" and the phone calls being cut off - more than once) AS WELL, as the Joburg head office, we are still awaiting the credit note, however they are now in possession of the faulty cylinder, which was only collected this week (after emails back and forth to remind them to arrange collection). Please can someone forward assistance with how to rectify this situation or deal with this company.

We DO NOT recommend using this company as your preferred gas provider.