After submitting a claim Dec 2015,still no payment

I'm extremely frustrated with Polmed Finance and customer service as a whole. I submitted a claim early December 2015 plus my husband's updated bank details because they still had his old details on the system. Claim was paid in January 2016. I called to asked what's the status on the claim and they advised it's already paid. When i asked into which account, low and behold. They still had the old account info on the system. I re-sent the record amendment form again. This time around they said they will have to send a cheque as the old administrator cannot update any details on the system. After many calls and emails the cheque was sent on the 16th February 2016, we received it about 3 weeks later, it was too late, because after 3 weeks the cheque will bounce. i sent and email in March 2016,no response. I decided to call again today. Now i am being advised to re-sent the cheque to MHG which will then forward to Med scheme to pay us. I have no idea where this cheque is. Must have thrown it away because it's useless. It might not be a lot of money,but it's all about the principle.