Failure to allocate lumpsum investment to tax free

I deposited a lump sum investment into one of Old Mutual's tax free savings products on 16 Feb. After phoning several times to follow up on the allocation of the funds to my account, no call centre agent has been able to explain why the money has not been allocated and provide assurance that the funds will be allocated before the close of the tax year. Will consider moving my tax free investment to another investment house after this experience.