Poor service from VWSA

I'm having a Service Plan with VW and requested a debit order with them and in January they rep**** in May sending me their banking details and they said they unable to do a debit order I rather pay manually. I did from May until now. My car was due for service I took it to the dealer and they asked if I have a service plan or I am paying cash I told them I have plan. When they checked on their system the said my plan was cancelled in January then I showed them all my proof of payment then they called VWSA. I had to wait there for over 2 hours for them to resolve the issue when they call them, they said that the plan is not active and are unable to see the payment, they said the warranty department is closed only opening on the 6th of January therefore they won't be able to assist me. Later they called me and said my plan was cancelled in June due to non payment I sent them all the proof of payment then they said they will investigate and get back to me. I then called again the same day they said my plan was in errears because I did not pay for February to April. Then I asked them if my plan was cancelled in June I asked them why didn't they communicate with me to say they are cancelling my plan and again I keep on paying after June and they receiving the payment for the plan that was cancelled and they did not action they kept quite. I asked them for refund for all the months that I have paid which is from May until December they said they will only refund me for December.

That time my car is due for service. I am not happy with their service at all😡