Android mobile to PC texting software program

We have excel mobile phone list of 4,000 club members, we update these to an Android mobile, we wish to link the mobile to PC to send out sms messages automatically, will require error report, for failed numbers, Text messages can go out in blocks of up to 100 as per our mobile providers systems without being blocked or slowed down, so scheduling messages to leave every few seconds will be necessary. There will be a need for atempts to cease for a particular number after three atempts, so as to allow completion of the task, without slowing up. We have tried several propriatory on line services, but have been ripped off or they dont work. We send out messages up to once a week, so need to keep costs low,any help appreciated, regards John Wroughton