Terrible service and no response to emails

I have an account with this service provider account number ***. Every time I have service request it takes more than weeks before it is attended to, I call and call and call. Every time i am given a different number to call and told someone will call me back. On the 9th April I called to request a settlement letter and forms to complete to sell the vehicle, I was told they would send it to me, I folloed up again the next day and Nothing. I called again Monday 14th April to be told I must send an email to another department which would respond within 72 hours, I have called and called post the 72 hours and it's pillar to post. I get given different numbers each time. There is no help available in the whatsapp line, the online portal is not working.