Non-existent Customer Service

I am very disappointed with the customer service that is being dished out to me as an investor by RSA Retail Bonds. I have made a request for withdrawal on my investment last month (in April) on what was going to take seven business days for the funds to reflet on my bank account but till today there are no funds paid. I even sent a follow up email to enquires but no response. I tried to reach them telephonically through their call centre and I would hold for almost an hour on each occasion. It seems like no one is willing to answer the phone.