Billed for expired service pkan

I had this service plan with Innovation which expired in December 2018 and I extend my service plan,to my surprise you have debited the premium for service that expired and the new one which I took in December 2018.Now they debit for expired service plan and the current.When I am enquiring about this billing I am told they have to bill me for another 10 months for expired plan??that's ********** have explained that to me even for the current policy it was not explained how many I have to pay for. It was explained that it is a 2 years plan or 70 000 /80 000km whichever comes first.I need my premium back.I have heard that you don't refund your clients.I will go to my bank and reverse the premium so the new service plan I took I will wait for you to extract your voice recordings where you thought it was explained to me about 37 months payment because I was told about 3 months waiting period.Even when I extend my service plan I asked the consultant about Dec deduction which he mentioned it would be the last thereafter I will decide whether I will continue with you or not.